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Revision as of 10:47, 26 April 2006 view source59.167.4.224 (talk) Humans: Replaced with paragraphs that deal more specifically with heterosexual identity and less on general sex and gender identity.← Previous edit Latest revision as of 22:15, 20 December 2024 view source UtherSRG (talk | contribs)Autopatrolled, Administrators177,108 edits Restored revision 1261634201 by MrOllie (talk): ...because that's in keeping with our MOSTags: Twinkle Undo 
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{{short description|Attraction between people of the opposite sex or gender}}
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{{about|heterosexuality in humans|heterosexuality in other animals|Animal sexual behaviour|the album by Shamir|Heterosexuality (album){{!}}''Heterosexuality'' (album)}}
{{Sexual orientation}} {{Sexual orientation}}
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'''Heterosexuality''' primarily refers to ], ], and ] attraction exclusively between two individuals of opposite ]s. It is characterised as a ], contrasted with ] and ].
'''Heterosexuality''' is ], ] or ] between people of the opposite ] or ].<!-- NOTE: "Sex" and "gender" are not always the same thing; for example, "sex" may refer to "biological sex" (being male or female), while "gender" may refer to a person's gender identity of being a man or a woman; therefore, like the Sexual orientation, Homosexuality and Bisexuality articles, we have included both in the lead. --> As a ], heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to people of the opposite sex. It "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions."<ref name="apahelp">{{cite web|title=Sexual orientation, homosexuality and bisexuality|publisher=]|access-date=August 10, 2013|url=http://www.apa.org/helpcenter/sexual-orientation.aspx|archive-date=August 8, 2013|archive-url=https://web.archive.org/web/20130808032050/http://www.apa.org/helpcenter/sexual-orientation.aspx}}</ref><ref name="brief">{{cite web|url=http://www.courtinfo.ca.gov/courts/supreme/highprofile/documents/Amer_Psychological_Assn_Amicus_Curiae_Brief.pdf |title=APA California Amicus Brief |publisher=Courtinfo.ca.gov |access-date=2013-10-11}}</ref> Someone who is heterosexual is commonly referred to as ''straight.''

Along with ] and ], heterosexuality is one of the three main categories of sexual orientation within the ].<ref name="apahelp"/> Across cultures, most people are heterosexual, and heterosexual activity is by far the most common type of sexual activity.<ref name=Bailey16/><ref name=":0">{{Cite web|url=https://www.britannica.com/topic/human-sexual-activity|title=Human sexual activity – Sociosexual activity|website=Encyclopedia Britannica|language=en|access-date=2019-12-21}}</ref>

Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of ], ], and ],<ref name="pediatrics2004"/><ref name="Lamanna">{{cite book|first1=Mary Ann |last1=Lamanna |first2=Agnes |last2=Riedmann |first3=Susan D |last3=Stewart|title=Marriages, Families, and Relationships: Making Choices in a Diverse Society|publisher=]|isbn=978-1-305-17689-8|year=2014|page=82|access-date=February 11, 2016|url=https://books.google.com/books?id=fofaAgAAQBAJ&pg=PA82|quote=The reason some individuals develop a gay sexual identity has not been definitively established &nbsp;– nor do we yet understand the development of heterosexuality. The American Psychological Association (APA) takes the position that a variety of factors impact a person's sexuality. The most recent literature from the APA says that sexual orientation is not a choice that can be changed at will, and that sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors...is shaped at an early age... biological, including genetic or inborn hormonal factors, play a significant role in a person's sexuality (American Psychological Association 2010).}}</ref><ref name="Stuart">{{cite book|author=Gail Wiscarz Stuart|title=Principles and Practice of Psychiatric Nursing|publisher=]|isbn=978-0-323-29412-6|year=2014|page=502|access-date=February 11, 2016|url=https://books.google.com/books?id=ivALBAAAQBAJ&pg=PA502|quote=No conclusive evidence supports any one specific cause of homosexuality; however, most researchers agree that biological and social factors influence the development of sexual orientation.}}</ref> and do not view it as a choice.<ref name="pediatrics2004"/><ref name="Lamanna"/><ref name="Kersey-Matusiak">{{cite book|author=Gloria Kersey-Matusiak|title=Delivering Culturally Competent Nursing Care|publisher=]|isbn=978-0-8261-9381-0|year=2012|page=169|access-date=February 10, 2016|url=https://books.google.com/books?id=X8O_wGedAYoC&pg=PA169|quote=Most health and mental health organizations do not view sexual orientation as a 'choice.'}}</ref> Although no single theory on the cause of sexual orientation has yet gained widespread support, scientists favor ].<ref name="pediatrics2004">{{cite journal |doi=10.1542/peds.113.6.1827 |author=Frankowski BL|author2=American Academy of Pediatrics Committee on Adolescence|title=Sexual orientation and adolescents |journal=]|volume=113 |issue=6 |pages=1827–32 |date=June 2004|pmid=15173519|url=http://pediatrics.aappublications.org/content/113/6/1827.long|doi-access=free}}</ref> There is considerably more evidence supporting nonsocial, biological causes of sexual orientation than social ones, especially for males.<ref name=Bailey16>{{cite journal|last1=Bailey|first1=J. Michael|last2=Vasey|first2=Paul|last3=Diamond|first3=Lisa|author4-link=Marc Breedlove|last4=Breedlove|first4=S. Marc|last5=Vilain|first5=Eric|last6=Epprecht|first6=Marc|title=Sexual Orientation, Controversy, and Science|journal=Psychological Science in the Public Interest|date=2016|volume=17|issue=2|pages=45–101|doi=10.1177/1529100616637616|pmid=27113562|url=https://www.researchgate.net/publication/301639075|doi-access=free}}</ref><ref name=LeVay>{{cite book |last=LeVay |first=Simon |date=2017 |title=Gay, Straight, and the Reason Why: The Science of Sexual Orientation |url=https://books.google.com/books?id=HmQFFfa03nkC |publisher=Oxford University Press |isbn=9780199752966 }}</ref><ref name=Balthazart>{{cite book |last=Balthazart |first=Jacques |date=2012 |title=The Biology of Homosexuality |url=https://books.google.com/books?id=3fjGjlcVINkC |publisher=Oxford University Press |isbn=9780199838820 }}</ref>

The term ''heterosexual'' or ''heterosexuality'' is usually applied to ]s, but heterosexual behavior is observed in all other ]s and in other animals, as it is necessary for ].

== Terminology ==
{{see also|Terminology of homosexuality}}

''Hetero-'' comes from the Greek word ''ἕτερος'' , meaning "other party" or "another",<ref>Klein, Ernest, ''A Comprehensive Etymological Dictionary of the English Language: dealing with the origin of words and their sense development thus illustrating the history of civilization and culture'', p. 345. Oxford: Elsevier, 2000</ref> used in science as a ] meaning "different";<ref>{{cite web|url=http://dictionary.reference.com/browse/hetero |title=Hetero &#124; Define Hetero at Dictionary.com |website=Dictionary.reference.com |access-date=2016-07-07}}</ref> and the Latin word for sex (that is, characteristic sex or ]).

The current use of the term ''heterosexual'' has its roots in the broader 19th century tradition of personality taxonomy. The term ''heterosexual'' was coined alongside the word ''homosexual'' by ] in 1869.<ref name=oosterhuis>{{cite journal |last1=Oosterhuis |first1=Harry |title=Sexual Modernity in the Works of Richard von Krafft-Ebing and Albert Moll |journal=Medical History |date=1 June 2012 |volume=56 |issue=2 |pages=133–155 |doi=10.1017/mdh.2011.30|pmid=23002290 |pmc=3381524 }}</ref> The terms were not in current use during the late nineteenth century, but were reintroduced by ] and ] around 1890.<ref name=oosterhuis/> The noun came into wider use from the early 1920s, but did not enter common use until the 1960s. The colloquial shortening "hetero" is attested from 1933. The abstract noun "heterosexuality" is first recorded in 1900.<ref>Mills, Jonathan, ''Love, Covenant & Meaning'', p. 22, Regent College Publishing, 1997.</ref> The word ''"heterosexual"'' was listed in Merriam-Webster's ''New International Dictionary'' in 1923 as a ] for "morbid sexual passion for one of the opposite sex"; however, in 1934 in their ''Second Edition Unabridged'' it is defined as a "manifestation of sexual passion for one of the opposite sex; normal sexuality".<ref>Katz, Jonathan Ned (1995) ''The Invention of Heterosexuality'', p. 92. New York, NY: Dutton (Penguin Books). {{ISBN|0-525-93845-1}}</ref>

Hyponyms of heterosexual include ''heteroflexible''.<ref>Porn.com: Making Sense of Online Pornography - Page 229, Feona Attwood - 2010</ref><ref>Patience: A Gay Man's Virtue - Page 80, La Lumiere - 2012</ref>

The word can be informally<ref>"hetero." Dictionary.com Unabridged. Random House, Inc. 12 May. 2012. .</ref> shortened to "hetero".<ref>{{cite encyclopedia|url=http://www.merriam-webster.com/medical/hetero |title=hetero |dictionary=Merriam-Webster |access-date=2013-10-11}}</ref> The term ''straight'' originated as a mid-20th century ] term for heterosexuals, ultimately coming from the phrase "to go straight" (as in "straight and narrow"), or stop engaging in homosexual sex. One of the first uses of the word in this way was in 1941 by author G. W. Henry.<ref name=Henry>Henry, G. W. (1941). ''Sex Variants: A Study of Homosexual Patterns''. New York: Paul B. Hoeber</ref> Henry's book concerned conversations with homosexual males and used this term in connection with people who are identified as ]s. It is now simply a colloquial term for "heterosexual", having changed in primary meaning over time. Some object to usage of the term ''straight'' because it implies that non-heterosexual people are crooked.<ref>Encyclopedia Of School Psychology - Page 298, T. Steuart Watson, Christopher H. Skinner - 2004</ref>

==Demographics ==
{{Main|Demographics of sexual orientation}}
In their 2016 literature review, Bailey ''et al.'' stated that they "expect that in all cultures the vast majority of individuals are sexually predisposed exclusively to the other sex (i.e., heterosexual)" and that there is no persuasive evidence that the demographics of sexual orientation have varied much across time or place.<ref name="Bailey16" /> Heterosexual activity between only one male and one female is by far the most common type of sociosexual activity.<ref name=":0" />

According to several major studies, 89% to 98% of people have had only heterosexual contact within their lifetime;<ref name = Laumann1994>{{cite book|vauthors=Laumann EO, Gagnon JH, Michael RT, Michaels S|year=1994|title=The social organization of sexuality: Sexual practices in the United States|location=Chicago|publisher=University of Chicago Press|isbn=0226469573}}{{Page needed|date=September 2010}}</ref><ref name = Wellings1994>Wellings, K., Field, J., Johnson, A., & Wadsworth, J. (1994). ''Sexual behavior in Britain: The national survey of sexual attitudes and lifestyles.'' London, UK: Penguin Books.{{Page needed|date=September 2010}}</ref><ref name = Bogaert2004>{{Cite journal|author=Bogaert AF |title=The prevalence of male homosexuality: the effect of fraternal birth order and variations in family size |journal=Journal of Theoretical Biology |volume=230 |issue=1 |pages=33–7 |date=September 2004 |pmid=15275997 |doi=10.1016/j.jtbi.2004.04.035|bibcode=2004JThBi.230...33B }} Bogaert argues that: "The prevalence of male homosexuality is debated. One widely reported early estimate was 10% (e.g., Marmor, 1980; Voeller, 1990). Some recent data provided support for this estimate (Bagley and Tremblay, 1998), but most recent large national samples suggest that the prevalence of male homosexuality in modern western societies, including the United States, is lower than this early estimate (e.g., 1–2% in Billy et al., 1993; 2–3% in Laumann et al., 1994; 6% in Sell et al., 1995; 1–3% in Wellings et al., 1994). It is of note, however, that homosexuality is defined in different ways in these studies. For example, some use same-sex behavior and not same-sex attraction as the operational definition of homosexuality (e.g., Billy et al., 1993); many sex researchers (e.g., Bailey et al., 2000; Bogaert, 2003; Money, 1988; Zucker and Bradley, 1995) now emphasize attraction over overt behavior in conceptualizing sexual orientation." (p. 33) Also: "...the prevalence of male homosexuality (in particular, same-sex attraction) varies over time and across societies (and hence is a "moving target") in part because of two effects: (1) variations in fertility rate or family size; and (2) the fraternal birth order effect. Thus, even if accurately measured in one country at one time, the rate of male homosexuality is subject to change and is not generalizable over time or across societies." (p. 33)</ref><ref name=SavinWilliams2009>{{Cite book | editor1-last = Hope | editor1-first = Debra A | title = Contemporary Perspectives on Lesbian, Gay, and Bisexual Identities | doi = 10.1007/978-0-387-09556-1 | series = Nebraska Symposium on Motivation | volume = 54 | year = 2009 | isbn = 978-0-387-09555-4 | url = https://archive.org/details/contemporarypers0000nebr }}</ref> but this percentage falls to 79–84% when either or both same-sex attraction and behavior are reported.<ref name=SavinWilliams2009/>

A 1992 study reported that 93.9% of males in Britain have only had heterosexual experience, while in France the number was reported at 95.9%.<ref>{{cite web|url=https://query.nytimes.com/gst/fullpage.html?res=9E0CE0D91E3EF93BA35751C1A964958260|title=Sexual Behavior Levels Compared in Studies In Britain and France|date=8 December 1992|work=]}}</ref> According to a 2008 poll, 85% of ] have only opposite-sex sexual contact while 94% of Britons identify themselves as heterosexual.<ref name=guardianpoll>{{cite news|url=https://www.theguardian.com/lifeandstyle/2008/oct/26/relationships |title=Sex uncovered poll: Homosexuality |newspaper=Guardian |date= 26 October 2008|access-date=24 August 2010 | location=London}}</ref> Similarly, a survey by the UK ] (ONS) in 2010 found that 95% of Britons identified as heterosexual, 1.5% of Britons identified themselves as homosexual or bisexual, and the last 3.5% gave more vague answers such as "don't know", "other", or did not respond to the question.<ref name="more-or-less-2010-10-01">{{cite web|last=Harford|first=Tim|title=More or Less examines Office for National Statistics figures on gay, lesbian and bisexual people|url=http://www.bbc.co.uk/programmes/b00tznbk|publisher=BBC|date=1 October 2010}}</ref><ref>{{cite web|title=Measuring Sexual Identity : Evaluation Report, 2010|url=http://www.ons.gov.uk/ons/rel/ethnicity/measuring-sexual-identity---evaluation-report/2010/index.html|publisher=]|date=23 September 2010}}</ref> In the United States, according to a ] report in April 2011, 96% or approximately 250 million of the adult population are heterosexual.<ref>{{cite web |url=http://williamsinstitute.law.ucla.edu/research/census-lgbt-demographics-studies/how-many-people-are-lesbian-gay-bisexual-and-transgender |author=Gary Gates |title=How Many People are Lesbian, Gay, Bisexual and Transgender? |publisher=] |date=April 2011 |access-date=May 12, 2014 |archive-date=July 21, 2017 |archive-url=https://web.archive.org/web/20170721165514/http://williamsinstitute.law.ucla.edu/research/census-lgbt-demographics-studies/how-many-people-are-lesbian-gay-bisexual-and-transgender/ |url-status=dead }}{{cite web |url=http://williamsinstitute.law.ucla.edu/wp-content/uploads/Gates-How-Many-People-LGBT-Apr-2011.pdf |author=Gary Gates |title=How many people are lesbian, gay, bisexual, and transgender? |publisher=] |page=1 |date=April 2011}}</ref>

An October 2012 ] poll provided unprecedented demographic information about those who identify as heterosexual, arriving at the conclusion that 96.6%, with a margin of error of ±1%, of all U.S. adults identify as heterosexual.<ref name=gallup>{{cite web |url=http://www.gallup.com/poll/158066/special-report-adults-identify-lgbt.aspx |title=Special Report: 3.4% of U.S. Adults Identify as LGBT |last1=Gates |first1=Gary J. |last2=Newport |first2=Frank |date=2012-10-18 |website=] |access-date=2015-01-13}}</ref> The Gallup results show:

{| class="wikitable sortable" style="margin:auto;"
|-
! style="width:100px;"|Age/Gender
! style="width:50px;"|Heterosexual
! style="width:50px;"|Non-heterosexual
! style="width:80px;"|Don't{{nbsp}}know/Refused
|-
| '''18–29'''
| style="text-align:center;"|90.1%
| style="text-align:center;"|6.4%
| style="text-align:center;"|3.5%
|-
| '''30–49'''
| style="text-align:center;"|93.6%
| style="text-align:center;"|3.2%
| style="text-align:center;"|3.2%
|-
| '''50–64'''
| style="text-align:center;"|93.1%
| style="text-align:center;"|2.6%
| style="text-align:center;"|4.3%
|-
| '''65+'''
| style="text-align:center;"|91.5%
| style="text-align:center;"|1.9%
| style="text-align:center;"|6.5%
|-
| colspan="4" style="text-align:center; height:20px;"|
|-
| '''18–29, Women'''
| style="text-align:center;"|88.0%
| style="text-align:center;"|8.3%
| style="text-align:center;"|3.8%
|-
| '''18–29, Men'''
| style="text-align:center;"|92.1%
| style="text-align:center;"|4.6%
| style="text-align:center;"|3.3%
|}

In a 2015 YouGov survey of 1,000 adults of the United States, 89% of the sample identified as heterosexual, 4% as homosexual (2% as homosexual male and 2% as homosexual female) and 4% as bisexual (of either sex).<ref>{{cite report|url=https://d25d2506sfb94s.cloudfront.net/cumulus_uploads/document/isqcugzp6d/tabs_OPI_Kinsey_Scale_20150813.pdf|publisher=Yougov|date=21 August 2015|title=Yougov report}}</ref>

Bailey ''et al.'', in their 2016 review, stated that in recent Western surveys, about 93% of men and 87% of women identify as completely heterosexual, and about 4% of men and 10% of women as mostly heterosexual.<ref name=Bailey16/>

== Academic study ==
=== Biological and environmental===
{{Main|Biology and sexual orientation|Environment and sexual orientation}}
No simple and singular determinant for ] has been conclusively demonstrated, but scientists believe that a combination of genetic, hormonal, and environmental factors determine sexual orientation.<ref name="pediatrics2004" /><ref name="Lamanna"/><ref name="Stuart"/> They favor biological theories for explaining the causes of sexual orientation,<ref name=Bailey16/><ref name="pediatrics2004"/> as there is considerably more evidence supporting nonsocial, biological causes than social ones, especially for males.<ref name=Bailey16/><ref name=LeVay/><ref name=Balthazart/>

Factors related to the development of a heterosexual orientation include ]s, ], and ] structure, and their interaction with the environment.

==== Prenatal hormones ====
{{Main|Prenatal hormones and sexual orientation|Neuroscience and sexual orientation}}
{{multiple image
| align = vertical
| width1 = 168
| image1 = 2AM9.png
| caption1 = Structure of the ] (rainbow cartoon) complexed with testosterone (white sticks).<ref name="pmid16641486">{{PDB|2AM9}}; {{cite journal |vauthors=Pereira de Jésus-Tran K, Côté PL, Cantin L, Blanchet J, Labrie F, Breton R | title = Comparison of crystal structures of human androgen receptor ligand-binding domain complexed with various agonists reveals molecular determinants responsible for binding affinity | journal = Protein Sci. | volume = 15 | issue = 5 | pages = 987–99 | date =May 2006 | pmid = 16641486 | pmc = 2242507 | doi = 10.1110/ps.051905906 }}</ref>
| width2 = 185
| image2 = Testosterone-from-xtal-3D-balls.png
| caption2 = ] contributes to the masculinization of the brain
| width3 = 200
| image3 = Oestradiol-3D-balls.png
| caption3 = ] also stimulates the ]s.
}}

The neurobiology of the masculinization of the brain is fairly well understood. ] and ], which is catalyzed by the enzyme ] into ], act upon ]s in the brain to masculinize it. If there are few androgen receptors (people with ]) or too much androgen (females with ]), there can be physical and psychological effects.<ref>Vilain, E. (2000). Genetics of Sexual Development. Annual Review of Sex Research, 11:1–25</ref> It has been suggested that both male and female heterosexuality are the results of this process.<ref>Wilson, G. and Rahman, Q., (2005). Born Gay. Chapter 5. London: Peter Owen Publishers</ref> In these studies heterosexuality in females is linked to a lower amount of masculinization than is found in lesbian females, though when dealing with male heterosexuality there are results supporting both higher and lower degrees of masculinization than homosexual males.

==== Animals and reproduction ====
{{multiple image
| align = vertical
| width1 = 220
| image1 = Bonobo sexual behavior 1.jpg
| caption1 = Bonobos mating, ].
| width2 = 220
| image2 = Hoverflies mating midair.jpg
| caption2 = ] mating in midair flight.
}}
{{Main|Animal sexual behaviour|Mating}}
{{See also|Pair bond|Mating call}}

Sexual reproduction in the ] is facilitated through opposite-sex sexual activity, although there are also animals that ], including ] and lower ].<ref>''The Columbia Encyclopedia'' (Colum. Univ. Press, 5th ed. <nowiki></nowiki> 1993 ({{ISBN|0-395-62438-X}})), entry ''Reproduction''.</ref>

Reproductive sex does not require a heterosexual orientation, since sexual orientation typically refers to a long-term enduring pattern of sexual and emotional attraction leading often to long-term social bonding, while reproduction requires as little as a single act of ] to ] the ] by ].<ref>{{cite web|url=http://www.goaskalice.columbia.edu/0116.html |title=Go Ask Alice!: Pregnant without intercourse? |access-date=January 24, 2016 |url-status=dead |archive-url=https://web.archive.org/web/20111222043503/http://www.goaskalice.columbia.edu/0116.html |archive-date=December 22, 2011 }}</ref><ref>{{cite web|url=http://www.americanpregnancy.org/preventingpregnancy/pregnancyfaqmyths.html |title=Can Pregnancy Occur &#124; Pregnancy Myths on How Pregnancy Occurs |website=Americanpregnancy.org |date= 2012-04-24|access-date=2016-07-07}}</ref><ref>Lawyers Guide to Forensic Medicine SBN 978-1-85941-159-9 By Bernard Knight - Page 188 "Pregnancy is well known to occur from such external ejaculation ..."</ref>

===Sexual fluidity===
{{Main|Sexual identity|Sexual fluidity}}
Often, sexual orientation and ] are not distinguished, which can impact accurately assessing sexual identity and whether or not sexual orientation is able to change; sexual orientation identity can change throughout an individual's life, and may or may not align with biological sex, sexual behavior or actual sexual orientation.<ref name="Sinclair">Sinclair, Karen, About Whoever: The Social Imprint on Identity and Orientation, NY, 2013 {{ISBN|9780981450513}}</ref><ref name="Rosario et al.">{{cite journal | last1 = Rosario | first1 = M. | last2 = Schrimshaw | first2 = E. | last3 = Hunter | first3 = J. |last4 = Braun | first4 = L. | year = 2006 | title = Sexual identity development among lesbian, gay, and bisexual youths: Consistency and change over time | journal = Journal of Sex Research | volume = 43 | issue = 1| pages = 46–58 | doi=10.1080/00224490609552298| pmc = 3215279 | pmid=16817067}}</ref><ref name="Concordance/discordance in SO">{{cite journal|first=Michael W.|last=Ross|author2=Essien, E. James |author3=Williams, Mark L. |author4= Fernandez-Esquer, Maria Eugenia. |title=Concordance Between Sexual Behavior and Sexual Identity in Street Outreach Samples of Four Racial/Ethnic Groups|publisher=American Sexually Transmitted Diseases Association|year=2003|pmid=12567166|journal=Sexually Transmitted Diseases|volume=30|issue=2|pages=110–113|doi=10.1097/00007435-200302000-00003|s2cid=21881268|doi-access=free}}</ref> Sexual orientation is stable and unlikely to change for the vast majority of people, but some research indicates that some people may experience change in their sexual orientation, and this is more likely for women than for men.<ref name=fluidity>
*{{cite journal|last1=Bailey|first1=J. Michael|last2=Vasey|first2=Paul|last3=Diamond|first3=Lisa|last4=Breedlove|first4=S. Marc|last5=Vilain|first5=Eric|last6=Epprecht|first6=Marc|title=Sexual Orientation, Controversy, and Science|journal=Psychological Science in the Public Interest|date=2016|volume=17|issue=2|pages=45–101|doi=10.1177/1529100616637616|url=https://www.researchgate.net/publication/301639075|quote=Sexual fluidity is situation-dependent flexibility in a person’s sexual responsiveness, which makes it possible for some individuals to experience desires for either men or women under certain circumstances regardless of their overall sexual orientation....We expect that in all cultures the vast majority of individuals are sexually predisposed exclusively to the other sex (i.e., heterosexual) and that only a minority of individuals are sexually predisposed (whether exclusively or non-exclusively) to the same sex.|pmid=27113562|doi-access=free}}
*{{cite book|first1=Dennis |last1=Coon|first2=John O. |last2=Mitterer|title=Introduction to Psychology: Gateways to Mind and Behavior with Concept Maps and Reviews|publisher=]|isbn=978-1111833633|year=2012|page=372|access-date=February 18, 2016|url=https://books.google.com/books?id=EYwjCQAAQBAJ&pg=PA372|quote=Sexual orientation is a deep part of personal identity and is usually quite stable. Starting with their earliest erotic feelings, most people remember being attracted to either the opposite sex or the same sex. The fact that sexual orientation is usually quite stable doesn't rule out the possibility that for some people sexual behavior may change during the course of a lifetime.}}
*{{cite book|first1=Eric |last1=Anderson|first2=Mark |last2=McCormack|title=The Changing Dynamics of Bisexual Men's Lives|chapter=Measuring and Surveying Bisexuality|publisher= ]|isbn=978-3-319-29412-4|year=2016|page=47|access-date=June 22, 2019|chapter-url=https://books.google.com/books?id=7_AgDAAAQBAJ&pg=PA47|quote=esearch suggests that women's sexual orientation is slightly more likely to change than men's (Baumeister 2000; Kinnish et al. 2005). The notion that sexual orientation can change over time is known as ''sexual fluidity''. Even if sexual fluidity exists for some women, it does not mean that the majority of women will change sexual orientations as they age – rather, sexuality is stable over time for the majority of people.}}</ref> The American Psychological Association distinguishes between sexual orientation (an innate attraction) and sexual orientation identity (which may change at any point in a person's life).<ref name=apa2009-2>{{cite web|title=Appropriate Therapeutic Responses to Sexual Orientation|publisher=]|pages=63, 86|date=2009|access-date=February 3, 2015|url=http://www.apa.org/pi/lgbc/publications/therapeutic-response.pdf}}</ref>

A 2012 study found that 2% of a sample of 2,560 adult participants reported a change of sexual orientation identity after a 10-year period. For men, a change occurred in 0.78% of those who had identified as heterosexual, 9.52% of homosexuals, and 47% of bisexuals. For women, a change occurred in 1.36% of heterosexuals, 63.6% of lesbians, and 64.7% of bisexuals.<ref>{{cite journal | url = http://midus.wisc.edu/findings/pdfs/1153.pdf | author1 = Mock, S. E.|author2= Eibach, R. P. | year = 2012 | title = Stability and change in sexual orientation identity over a 10-year period in adulthood | journal = Archives of Sexual Behavior | volume = 41 | issue = 3 | pages = 641–648 | doi = 10.1007/s10508-011-9761-1 | pmid=21584828| s2cid = 15771368}}</ref>

A 2-year study by ] on a sample of 80 non-heterosexual female adolescents (age 16–23) reported that half of the participants had changed sexual-minority identities more than once, one third of them during the 2-year follow-up. Diamond concluded that "although sexual attractions appear fairly stable, sexual identities and behaviors are more fluid."<ref>{{cite journal | author = Diamond, L. M. | year = 2000 | title = Sexual identity, attractions, and behavior among young sexual-minority women over a 2-year period | journal = Developmental Psychology | volume = 36 | issue = 2 | pages = 241–250 | doi = 10.1037/0012-1649.36.2.241 | url = http://www.psych.utah.edu/people/people/diamond/Publications/Sexual%20identity,%20attractions,%20and%20behavior.pdf | pmid = 10749081 | access-date = 2015-04-20 | archive-url = https://web.archive.org/web/20100610021104/http://www.psych.utah.edu/people/people/diamond/Publications/Sexual%20identity%2C%20attractions%2C%20and%20behavior.pdf | archive-date = 2010-06-10 | url-status = dead }}</ref>

] is a form of sexual orientation or ] characterized by minimal homosexual activity in an otherwise primarily heterosexual orientation that is considered to distinguish it from bisexuality. It has been characterized as "mostly straight".<ref>{{cite journal |doi=10.1037/0012-1649.44.1.15 |last1=Thompson |first1=E.M. |last2=Morgan |first2=E.M. |year=2008 |title="Mostly straight" young women: Variations in sexual behavior and identity development |journal=Developmental Psychology |volume=44 |issue=1 |pages=15–21 |pmid=18194001}}</ref>

===Sexual orientation change efforts===
{{Main|Sexual orientation change efforts}}
Sexual orientation change efforts are methods that aim to change sexual orientation, used to try to convert homosexual and bisexual people to heterosexuality. Scientists and mental health professionals generally do not believe that sexual orientation is a choice.<ref name="pediatrics2004" /><ref name="Kersey-Matusiak"/> There are no studies of adequate scientific rigor that conclude that sexual orientation change efforts are effective.<ref name="apa2009">American Psychological Association: </ref>

== Society and culture ==
{{See also|History of human sexuality|Human mating strategies}}
]


A heterosexual couple, a man and woman in an ], form the core of a ].<ref>"... the core of a family is a heterosexual couple who have children who they raise to adulthood - the so-called nuclear family." </ref>
==Etymology==
Many societies throughout history have insisted that a ] take place before the couple settle down, but enforcement of this rule or compliance with it has varied considerably.


=== Symbolism ===
''Hetero-'' comes from the Greek word ''heteros'', meaning "different" (for other uses, see ], ]), and the Latin for sex (that is, characteristic sex or ]). The term "''heterosexual''" was ] shortly after and opposite to the word "homosexual" by ] in ] and was first published in ]. </nowiki>]] ''"Heterosexual"'' was first listed in Merriam-Websters's ''New International Dictionary'' as a medical term for "morbid sexual passion for one of the opposite sex", but in 1934 in their ''Second Edition Unabridged'' it is a "manifestation of sexual passion for one of the opposite sex; normal sexuality". (Katz, 1995)
]


Heterosexual symbolism dates back to the earliest artifacts of humanity, with ], ritual fertility carvings, and primitive art. This was later expressed in the symbolism of ] and ], which often included images of human ], such as ] in ]. Modern symbols of heterosexuality in societies derived from European traditions still reference symbols used in these ancient beliefs. One such image is a combination of the symbol for ], the Roman god of war, as the definitive ] symbol of masculinity, and ], the Roman goddess of love and beauty, as the definitive ] symbol of femininity. The ] character for this combined symbol is ⚤ (U+26A4).
==Biology==
===Humans===
Heterosexuality, like any forms of identity is very subjective. In western society, one is generally thought of as heterosexual if one derives either all, or the vast majority of their erotic and/or sexual stimulation from people of the different sex to them. In other cultures a heterosexual man may engage in homosexual intercourse provided that he keeps the role traditionally assigned to his ] during intercourse and his ] during the surrounding relationship. Also, in some cultures a heterosexually identifying man may assume any role during homosexual congress as a social action provided he maintains a relationship with a woman in his family life. Cultural allowances such as this have been historically rarer amongst women, but more recently have been tolerated more than the male equivalents largely because of its connection to some schools of ].


===Historical views===
Definitions of sexuality tends to be narrower to most heterosexuals than it is to people of other sexual orientations. In most cases a potential partner's sex is determined wholly by anatomic sex at birth and genetic sex. Many heterosexuals would argue that one who determination of a partner's sex deviates from that criterion cannot truly be heterosexual. Transgendered people and even those with many natural intersex conditions are very rarely seen as potential mates by heterosexuals, even those who consider themselves tolerant and accepting to such identities.
There was no need to coin a term such as ''heterosexual'' until terms emerged with which it could be compared and contrasted. Jonathan Ned Katz dates the definition of heterosexuality, as it is used today, to the late 19th century.<ref name="Katz">{{cite journal|last1=Katz|first1=Jonathan Ned|title=The Invention of Heterosexuality|journal=Socialist Review|date=January–March 1990|issue=20|pages=7–34|url=https://english101sp2015.files.wordpress.com/2015/03/jonathan-katz_the-invention-of-heterosexuality.pdf|access-date=5 December 2016}}</ref> According to Katz, in the ], sex was seen as a means to achieve reproduction, and relations between the sexes were not believed to be overtly sexual. The body was thought of as a tool for procreation – "Human energy, thought of as a closed and severely limited system, was to be used in producing children and in work, not wasted in libidinous pleasures."<ref name="Katz"/>


Katz argues that modern ideas of ] and ] began to develop in America and Germany in the later 19th century. The changing economy and the "transformation of the family from producer to consumer"<ref name="Katz"/> resulted in shifting values. The Victorian work ethic had changed, pleasure became more highly valued and this allowed ideas of human sexuality to change. ] had created a market for the erotic, pleasure became ]. At the same time medical doctors began to acquire more power and influence. They developed the medical model of "normal love", in which healthy men and women enjoyed sex as part of a "new ideal of male-female relationships that included.. an essential, necessary, normal eroticism."<ref name="Katz"/> This model also had a counterpart, "the Victorian Sex Pervert", anyone who failed to meet the ]. The basic oppositeness of the sexes was the basis for normal, healthy sexual attraction. "The attention paid the sexual abnormal created a need to name the sexual normal, the better to distinguish the average him and her from the deviant it."<ref name="Katz"/> The creation of the term ''heterosexual'' consolidated the social existence of the pre-existing heterosexual experience and created a sense of ensured and validated normalcy within it.
===Animals===
In the animal kingdom, the vast majority of ] results from heterosexual ] between sexually mature partners.


=== Religious views ===
==History and demographics==
{{See also|Religion and sexuality}}
{{multiple image
| align = vertical
| width1 = 186
| image1 = Peter Paul Rubens - Adam and Eve, after Titian, between 1628 and 1629.jpg
| caption1 = According to the ] of the ], ] are the first human couple and the ancestors of all humanity.
}}


The ] tradition has several scriptures related to heterosexuality. The ] states that God created women because "It is not good that the man should be alone; I will make him an help meet for him,",<ref>''Bible'', {{Bibleverse|Genesis|2:18|KJV}} (KJV)</ref> and that "Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh"<ref>''Bible'', {{Bibleverse|Genesis|2:24|KJV}} (KJV)</ref>
The prevalence of exclusive heterosexuality has varied over the centuries and also from culture to culture. ''See ]''


For the most part, religious traditions in the world reserve ] to heterosexual unions, but there are exceptions including certain ] and ] traditions, ]s, ], some ] dioceses, and some ], ], and ] and ] congregations.<ref>{{cite web|title=World Religions and Same Sex Marriage|url=http://marriagelaw.cua.edu/publications/wrr.pdf|website=] |archive-url=https://web.archive.org/web/20070620162822/http://marriagelaw.cua.edu/publications/wrr.pdf |archive-date=20 June 2007|access-date=1 April 2018|date=20 June 2007}}</ref><ref name=united> {{webarchive |url=https://web.archive.org/web/20120224005434/http://www.united-church.ca/exploring/marriage/affirmingcongregations |date=February 24, 2012 }}</ref>
Though there have always been individuals (sometimes in a majority, sometimes in a minority) who were exclusively attracted to those of the opposite sex, heterosexuality as an identity (just like homosexuality) has developed only since the middle of the nineteenth century.


Almost all religions believe that sex between a man and a woman within marriage is allowed, but there are a few that believe that it is a sin, such as The ], The ], and The ]. These religions tend to view all sexual relations as ]ful, and promote ]. Some religions require ] for certain roles, such as ]; however, the ] also views heterosexual marriage as sacred and necessary.<ref> {{webarchive|url=https://web.archive.org/web/20150201031249/https://www.vatican.va/archive/catechism/p2s2c3a7.htm#I|date=February 1, 2015}}</ref>
The history of heterosexuality is part of the ]. That history and science derivative of it is far from complete. Owing to complications of human politics and prejudice, coupled with the maleable nature of human behaviour, it will be some time before the history and nature of all forms of human sexual behaviour are truly known.


=== Heteronormativity and heterosexism ===
==Psychological factors relating to sexuality==
{{See also|Ex-gay movement|Heterosexuals Organized for a Moral Environment|National Association for Research & Therapy of Homosexuality}}
''Main article: ]''
]


] denotes or relates to a world view that promotes heterosexuality as the normal or preferred sexual orientation for people to have. It can assign strict gender roles to males and females. The term was popularized by ] in 1991.<ref>Warner, Michael (1991), "Introduction: Fear of a Queer Planet". ''Social Text''; 9 (4 ): 3–17</ref> Feminist ] argues that ], a continual and repeating reassertion of heterosexual norms, is a facet of heterosexism.<ref>Rich, Adrienne (1980), "Compulsory Heterosexuality and Lesbian Existence". "Signs"; Pages 631-660.</ref> Compulsory heterosexuality is the idea that female heterosexuality is both assumed and enforced by a patriarchal society. Heterosexuality is then viewed as the natural inclination or obligation by both sexes. Consequently, anyone who differs from the normalcy of heterosexuality is deemed deviant or abhorrent.<ref name=":0'">{{cite book|last=Rich|first=Adrienne|title=Compulsory Heterosexuality and Lesbian Existence|year=1980|publisher=Onlywomen Press Ltd|isbn=0-906500-07-9|page=|url=https://archive.org/details/compulsoryhetero00rich/page/32}}</ref>
A broad array of opinion holds that much human behavior ultimately is explainable in terms of ]. From this point of view, the shifting social balance between heterosexual and homosexual desire has evolved as a fitter survival strategy for the species than either an exclusively heterosexual or homosexual configuration of desire.


] is a form of ] or ] in favor of opposite-sex sexuality and relationships. It may include an assumption that everyone is heterosexual and may involve various kinds of discrimination against gays, lesbians, bisexuals, asexuals, ] people, or transgender or ] individuals.
In traditional societies individuals are often under heavy social pressure to marry and have children, irrespective of their sexual orientation. In modern society, many homosexual people who wish to have children have found a way to satisfy their nurturing instincts, either through fostering or adopting children, or through ] or ].


] is a slogan that arose in the late 1980s and early 1990s and has been used primarily by ] groups as a political stance and strategy.<ref name="Massachusetts">{{cite web|url=http://www.massresistance.org/docs/downloads/romney/CommReport_Making_Colleges_Safe_7-93.pdf|title=Making colleges and universities safe for gay and lesbian students: Report and recommendations of the Governor's Commission on Gay and Lesbian Youth|publisher=Massachusetts. Governor's Commission on Gay and Lesbian Youth}}, p.20. "A relatively recent tactic used in the backlash opposing les/bi/gay/trans campus visibility is the so-called "heterosexual pride" strategy".</ref> The term is described as a response to ]<ref name="Shifting Sands">{{cite book|last=Eliason|first=Michele J.|author2=Schope, Robert |chapter=Shifting Sands or Solid Foundation? Lesbian, Gay, Bisexual, and Transgender Identity Formation|title=The Health of Sexual Minorities|editor1=Meyer, Ilan H.|editor2= Northridge, Mary E.|year=2007|pages=3–26|doi=10.1007/978-0-387-31334-4_1|isbn=978-0-387-28871-0}} "Not surprisingly, individuals in the pride stage are most criticized not only by heterosexual persons but also many LGBT individuals, who are uncomfortable forcing the majority to share the discomfort. Heterosexual individuals may express bewilderment at the term "gay pride", arguing that they do not talk about "straight pride"".</ref><ref name="donthaveem">Eliason, Michele J. , p.55 (1996)</ref><ref name = "ChicagoTribune1">{{cite web|url=https://www.chicagotribune.com/2010/11/14/when-pride-turns-shameful/ |title=When pride turns shameful |first=Eric |last=Zorn |work=] |date=November 14, 2010}}</ref> adopted by various ] groups in the early 1970s or to the accommodations provided to gay pride initiatives.
Not all people who are attracted to, or have sexual relationships with members of the opposite sex identify themselves as heterosexual: people who do not identify primarily as heterosexual may sometimes engage in heterosexual behaviour. Similarly, some people frequently have sex with members of the same sex yet still see themselves as heterosexual. (See ''bisexuality'')


== See also ==
According to ] (APA), there are numerous theories about the origins of a person's sexual orientation, but some believe that "sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors", and that genetic factors play a "significant role" in determining a person's sexuality.</nowiki>]] The APA currently officially states that sexual orientation is not chosen and cannot be changed, a radical reversal from the recent past, when non-normative sexuality was considered a deviancy or mental ailment treatable through institutionalization or other radical means.
{{Portal|Human sexuality}}
<!--These should be links to articles not otherwise mentioned in the text, but within the subject area of the article-->
* ]
* ]
* ]
* ]


==Slang== == References ==
{{reflist}}
The term "'']''" is a mid-20th century ] term for heterosexuals, ultimately coming from the phrase "''to go straight''" (as in "straight and narrow"), or stop being gay </nowiki>]]. One of the first uses of the word in this way was in ] by author ]. Henry's book concerned conversations with homosexual males and used this term in connection with the reference to '']s''. Though not originally intended to refer to heterosexuals, like the meanings of many words, its primary usage has changed over time.


== Further reading ==
The term '']'', a word which is ], is sometimes used to describe heterosexuals.
<!--Any books or other material relevant to the article subject but not cited in the Notes section-->
* ]. ''Gay, Straight, and the Reason Why: The Science of Sexual Orientation'', Oxford University Press, 2017
* Johnson, P. (2005) ''Love, Heterosexuality and Society''. London: Routledge
* ].
* Bohan, Janis S., ''Psychology and Sexual Orientation: Coming to Terms'', Routledge, 1996 {{ISBN|0-415-91514-7}}
* ], et al., ''Sexual Behavior in the Human Male''. Indiana University Press. {{ISBN|0-253-33412-8}}
*Kinsey, Alfred C., et al., ''Sexual Behavior in the Human Female''. Indiana University Press. {{ISBN|0-253-33411-X}}


== External links ==
==References==
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# "''''". ].com, Webnox Corp. (Cited February 13, 2004)
# Wikholm, Andrew, "''''". Gay History.com. (Cited February 14, 2004)
# "''''". Descriptors for Sexual Minorities. , ]. ]. (Cited February 14, 2004)
# "''''" ]. (Cited February 9, 2004)
# "''''". World Sex Explorer. (Cited February 14, 2004)
# Katz, Jonathan Ned (1995) ''The Invention of Heterosexuality''. NY, NY: Dutton (Penguin Books). ISBN 0525938451.


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* Kinsey, Alfred C., et al., "''Sexual Behavior in the Human Female''". Indiana University Press. ISBN 025333411X
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* Musser, Trevor J., a well known heterosexual wrote "Loving women". Ohio University Press. ISBN 12243637134
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* Keel, Robert O., ''''. (Goode, 1994, chapter 8, and Chapter 9, 6th edition, 2001.) Sociology of Deviant Behavior: FS 2003, University of Missouri–St. Louis.
* Coleman, Thomas F., {{Webarchive|url=https://web.archive.org/web/20220601050035/http://www.unmarriedamerica.org/dp-wrong.html |date=2022-06-01 }} , American Association for Single People.
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* Keel, Robert O., "''''". (Goode, 1994, chapter 8, and Chapter 9, 6th edition, 2001.) Sociology of Deviant Behavior: FS 2003, University of Missouri - St. Louis.
* "''''". The News' View, Yale Daily News Publishing Company. ], ].
* Coleman, Thomas F., "''?''". , American Association for Single People.
* "''''". Heterosexual Experience Stories. Raw Psychology Productions.


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Latest revision as of 22:15, 20 December 2024

Attraction between people of the opposite sex or gender "Hetero" redirects here. For other uses, see Hetero (disambiguation). "Straight men" redirects here. For the comedy stock character type, see straight man.

This article is about heterosexuality in humans. For heterosexuality in other animals, see Animal sexual behaviour. For the album by Shamir, see Heterosexuality (album).
Sexual orientation
Sexual orientations
Related terms
Research
Animals
Related topics
A straight couple

Heterosexuality is romantic attraction, sexual attraction or sexual behavior between people of the opposite sex or gender. As a sexual orientation, heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to people of the opposite sex. It "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions." Someone who is heterosexual is commonly referred to as straight.

Along with bisexuality and homosexuality, heterosexuality is one of the three main categories of sexual orientation within the heterosexual–homosexual continuum. Across cultures, most people are heterosexual, and heterosexual activity is by far the most common type of sexual activity.

Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences, and do not view it as a choice. Although no single theory on the cause of sexual orientation has yet gained widespread support, scientists favor biologically based theories. There is considerably more evidence supporting nonsocial, biological causes of sexual orientation than social ones, especially for males.

The term heterosexual or heterosexuality is usually applied to humans, but heterosexual behavior is observed in all other mammals and in other animals, as it is necessary for sexual reproduction.

Terminology

See also: Terminology of homosexuality

Hetero- comes from the Greek word ἕτερος , meaning "other party" or "another", used in science as a prefix meaning "different"; and the Latin word for sex (that is, characteristic sex or sexual differentiation).

The current use of the term heterosexual has its roots in the broader 19th century tradition of personality taxonomy. The term heterosexual was coined alongside the word homosexual by Karl Maria Kertbeny in 1869. The terms were not in current use during the late nineteenth century, but were reintroduced by Richard von Krafft-Ebing and Albert Moll around 1890. The noun came into wider use from the early 1920s, but did not enter common use until the 1960s. The colloquial shortening "hetero" is attested from 1933. The abstract noun "heterosexuality" is first recorded in 1900. The word "heterosexual" was listed in Merriam-Webster's New International Dictionary in 1923 as a medical term for "morbid sexual passion for one of the opposite sex"; however, in 1934 in their Second Edition Unabridged it is defined as a "manifestation of sexual passion for one of the opposite sex; normal sexuality".

Hyponyms of heterosexual include heteroflexible.

The word can be informally shortened to "hetero". The term straight originated as a mid-20th century gay slang term for heterosexuals, ultimately coming from the phrase "to go straight" (as in "straight and narrow"), or stop engaging in homosexual sex. One of the first uses of the word in this way was in 1941 by author G. W. Henry. Henry's book concerned conversations with homosexual males and used this term in connection with people who are identified as ex-gays. It is now simply a colloquial term for "heterosexual", having changed in primary meaning over time. Some object to usage of the term straight because it implies that non-heterosexual people are crooked.

Demographics

Main article: Demographics of sexual orientation

In their 2016 literature review, Bailey et al. stated that they "expect that in all cultures the vast majority of individuals are sexually predisposed exclusively to the other sex (i.e., heterosexual)" and that there is no persuasive evidence that the demographics of sexual orientation have varied much across time or place. Heterosexual activity between only one male and one female is by far the most common type of sociosexual activity.

According to several major studies, 89% to 98% of people have had only heterosexual contact within their lifetime; but this percentage falls to 79–84% when either or both same-sex attraction and behavior are reported.

A 1992 study reported that 93.9% of males in Britain have only had heterosexual experience, while in France the number was reported at 95.9%. According to a 2008 poll, 85% of Britons have only opposite-sex sexual contact while 94% of Britons identify themselves as heterosexual. Similarly, a survey by the UK Office for National Statistics (ONS) in 2010 found that 95% of Britons identified as heterosexual, 1.5% of Britons identified themselves as homosexual or bisexual, and the last 3.5% gave more vague answers such as "don't know", "other", or did not respond to the question. In the United States, according to a Williams Institute report in April 2011, 96% or approximately 250 million of the adult population are heterosexual.

An October 2012 Gallup poll provided unprecedented demographic information about those who identify as heterosexual, arriving at the conclusion that 96.6%, with a margin of error of ±1%, of all U.S. adults identify as heterosexual. The Gallup results show:

Age/Gender Heterosexual Non-heterosexual Don't know/Refused
18–29 90.1% 6.4% 3.5%
30–49 93.6% 3.2% 3.2%
50–64 93.1% 2.6% 4.3%
65+ 91.5% 1.9% 6.5%
18–29, Women 88.0% 8.3% 3.8%
18–29, Men 92.1% 4.6% 3.3%

In a 2015 YouGov survey of 1,000 adults of the United States, 89% of the sample identified as heterosexual, 4% as homosexual (2% as homosexual male and 2% as homosexual female) and 4% as bisexual (of either sex).

Bailey et al., in their 2016 review, stated that in recent Western surveys, about 93% of men and 87% of women identify as completely heterosexual, and about 4% of men and 10% of women as mostly heterosexual.

Academic study

Biological and environmental

Main articles: Biology and sexual orientation and Environment and sexual orientation

No simple and singular determinant for sexual orientation has been conclusively demonstrated, but scientists believe that a combination of genetic, hormonal, and environmental factors determine sexual orientation. They favor biological theories for explaining the causes of sexual orientation, as there is considerably more evidence supporting nonsocial, biological causes than social ones, especially for males.

Factors related to the development of a heterosexual orientation include genes, prenatal hormones, and brain structure, and their interaction with the environment.

Prenatal hormones

Main articles: Prenatal hormones and sexual orientation and Neuroscience and sexual orientation Structure of the androgen receptor (rainbow cartoon) complexed with testosterone (white sticks).Testosterone contributes to the masculinization of the brainEstradiol also stimulates the androgen receptors.

The neurobiology of the masculinization of the brain is fairly well understood. Estradiol and testosterone, which is catalyzed by the enzyme 5α-reductase into dihydrotestosterone, act upon androgen receptors in the brain to masculinize it. If there are few androgen receptors (people with androgen insensitivity syndrome) or too much androgen (females with congenital adrenal hyperplasia), there can be physical and psychological effects. It has been suggested that both male and female heterosexuality are the results of this process. In these studies heterosexuality in females is linked to a lower amount of masculinization than is found in lesbian females, though when dealing with male heterosexuality there are results supporting both higher and lower degrees of masculinization than homosexual males.

Animals and reproduction

Bonobos mating, Jacksonville Zoo and Gardens.Hoverflies mating in midair flight. Main articles: Animal sexual behaviour and Mating See also: Pair bond and Mating call

Sexual reproduction in the animal world is facilitated through opposite-sex sexual activity, although there are also animals that reproduce asexually, including protozoa and lower invertebrates.

Reproductive sex does not require a heterosexual orientation, since sexual orientation typically refers to a long-term enduring pattern of sexual and emotional attraction leading often to long-term social bonding, while reproduction requires as little as a single act of copulation to fertilize the ovum by sperm.

Sexual fluidity

Main articles: Sexual identity and Sexual fluidity

Often, sexual orientation and sexual orientation identity are not distinguished, which can impact accurately assessing sexual identity and whether or not sexual orientation is able to change; sexual orientation identity can change throughout an individual's life, and may or may not align with biological sex, sexual behavior or actual sexual orientation. Sexual orientation is stable and unlikely to change for the vast majority of people, but some research indicates that some people may experience change in their sexual orientation, and this is more likely for women than for men. The American Psychological Association distinguishes between sexual orientation (an innate attraction) and sexual orientation identity (which may change at any point in a person's life).

A 2012 study found that 2% of a sample of 2,560 adult participants reported a change of sexual orientation identity after a 10-year period. For men, a change occurred in 0.78% of those who had identified as heterosexual, 9.52% of homosexuals, and 47% of bisexuals. For women, a change occurred in 1.36% of heterosexuals, 63.6% of lesbians, and 64.7% of bisexuals.

A 2-year study by Lisa M. Diamond on a sample of 80 non-heterosexual female adolescents (age 16–23) reported that half of the participants had changed sexual-minority identities more than once, one third of them during the 2-year follow-up. Diamond concluded that "although sexual attractions appear fairly stable, sexual identities and behaviors are more fluid."

Heteroflexibility is a form of sexual orientation or situational sexual behavior characterized by minimal homosexual activity in an otherwise primarily heterosexual orientation that is considered to distinguish it from bisexuality. It has been characterized as "mostly straight".

Sexual orientation change efforts

Main article: Sexual orientation change efforts

Sexual orientation change efforts are methods that aim to change sexual orientation, used to try to convert homosexual and bisexual people to heterosexuality. Scientists and mental health professionals generally do not believe that sexual orientation is a choice. There are no studies of adequate scientific rigor that conclude that sexual orientation change efforts are effective.

Society and culture

See also: History of human sexuality and Human mating strategies
An intimate heterosexual couple

A heterosexual couple, a man and woman in an intimate relationship, form the core of a nuclear family. Many societies throughout history have insisted that a marriage take place before the couple settle down, but enforcement of this rule or compliance with it has varied considerably.

Symbolism

A heterosexuality symbol

Heterosexual symbolism dates back to the earliest artifacts of humanity, with gender symbols, ritual fertility carvings, and primitive art. This was later expressed in the symbolism of fertility rites and polytheistic worship, which often included images of human reproductive organs, such as lingam in Hinduism. Modern symbols of heterosexuality in societies derived from European traditions still reference symbols used in these ancient beliefs. One such image is a combination of the symbol for Mars, the Roman god of war, as the definitive male symbol of masculinity, and Venus, the Roman goddess of love and beauty, as the definitive female symbol of femininity. The unicode character for this combined symbol is ⚤ (U+26A4).

Historical views

There was no need to coin a term such as heterosexual until terms emerged with which it could be compared and contrasted. Jonathan Ned Katz dates the definition of heterosexuality, as it is used today, to the late 19th century. According to Katz, in the Victorian era, sex was seen as a means to achieve reproduction, and relations between the sexes were not believed to be overtly sexual. The body was thought of as a tool for procreation – "Human energy, thought of as a closed and severely limited system, was to be used in producing children and in work, not wasted in libidinous pleasures."

Katz argues that modern ideas of sexuality and eroticism began to develop in America and Germany in the later 19th century. The changing economy and the "transformation of the family from producer to consumer" resulted in shifting values. The Victorian work ethic had changed, pleasure became more highly valued and this allowed ideas of human sexuality to change. Consumer culture had created a market for the erotic, pleasure became commoditized. At the same time medical doctors began to acquire more power and influence. They developed the medical model of "normal love", in which healthy men and women enjoyed sex as part of a "new ideal of male-female relationships that included.. an essential, necessary, normal eroticism." This model also had a counterpart, "the Victorian Sex Pervert", anyone who failed to meet the norm. The basic oppositeness of the sexes was the basis for normal, healthy sexual attraction. "The attention paid the sexual abnormal created a need to name the sexual normal, the better to distinguish the average him and her from the deviant it." The creation of the term heterosexual consolidated the social existence of the pre-existing heterosexual experience and created a sense of ensured and validated normalcy within it.

Religious views

See also: Religion and sexuality According to the creation myth of the Abrahamic religions, Adam and Eve are the first human couple and the ancestors of all humanity.

The Judeo-Christian tradition has several scriptures related to heterosexuality. The Book of Genesis states that God created women because "It is not good that the man should be alone; I will make him an help meet for him,", and that "Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh"

For the most part, religious traditions in the world reserve marriage to heterosexual unions, but there are exceptions including certain Buddhist and Hindu traditions, Unitarian Universalists, Metropolitan Community Church, some Anglican dioceses, and some Quaker, United Church of Canada, and Reform and Conservative Jewish congregations.

Almost all religions believe that sex between a man and a woman within marriage is allowed, but there are a few that believe that it is a sin, such as The Shakers, The Harmony Society, and The Ephrata Cloister. These religions tend to view all sexual relations as sinful, and promote celibacy. Some religions require celibacy for certain roles, such as Catholic priests; however, the Catholic Church also views heterosexual marriage as sacred and necessary.

Heteronormativity and heterosexism

See also: Ex-gay movement, Heterosexuals Organized for a Moral Environment, and National Association for Research & Therapy of Homosexuality
This image is often used on Straight Pride T-shirts

Heteronormativity denotes or relates to a world view that promotes heterosexuality as the normal or preferred sexual orientation for people to have. It can assign strict gender roles to males and females. The term was popularized by Michael Warner in 1991. Feminist Adrienne Rich argues that compulsory heterosexuality, a continual and repeating reassertion of heterosexual norms, is a facet of heterosexism. Compulsory heterosexuality is the idea that female heterosexuality is both assumed and enforced by a patriarchal society. Heterosexuality is then viewed as the natural inclination or obligation by both sexes. Consequently, anyone who differs from the normalcy of heterosexuality is deemed deviant or abhorrent.

Heterosexism is a form of bias or discrimination in favor of opposite-sex sexuality and relationships. It may include an assumption that everyone is heterosexual and may involve various kinds of discrimination against gays, lesbians, bisexuals, asexuals, heteroflexible people, or transgender or non-binary individuals.

Straight pride is a slogan that arose in the late 1980s and early 1990s and has been used primarily by social conservative groups as a political stance and strategy. The term is described as a response to gay pride adopted by various LGBT groups in the early 1970s or to the accommodations provided to gay pride initiatives.

See also

References

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