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A Natural History of Rape: Biological Bases of Sexual Coercion is a scientific history book published in 2000 by biologist Randy Thornhill and anthropologist Craig T. Palmer, which presents the hypothesis that rape evolved as a, in some situations, genetically advantageous behavioral adaptation. The book also argues that this does not justify rape and argues that better knowledge of causes will allow better prevention. This hypothesis is controversial.

Topics

Behavior as evolutionary adaptation

Thornhill and Palmer's argument begins with the statement that all human behaviors are, no matter how indirectly, the result of some evolutionary adaptation (see adaptationism). They note that since the human brain itself, and thus all capacities for any kind of action whatsoever, evolved from natural selection; the only point of dispute is whether rape is only a by-product of some other unrelated adaptation (such as a desire for aggression, domination, etc.) or if rape itself is an adaptation favored because it increases the number of descendants of rapists. The authors are in disagreement over which of these hypotheses will be confirmed by the evidence.

Childbearing ability of victims

Thornhill and Palmer argue that it is possible that the underlying motivations of rapists evolved because they were at one time conducive to reproduction. In the book, they note that the overwhelming majority of rape victims are of childbearing age, suggesting that childbearing ability is involved in a rapist's choice of victims. They also cite evidence that penile-vaginal intercourse is more likely to occur with rape victims who are of reproductive age, which they argue as evidence that men are at least somewhat sexually, and therefore reproductively, motivated.

Psychological adaptations of women

Women, they argue, have psychological adaptations that protect their genes from would-be rapists. "We feel that the woman's perspective on rape can be best understood by considering the negative influences of rape on female reproductive success", they write. For example, the book cites a study claiming that victims of optimal childbearing age suffer more emotional trauma from rape than older women or pre-pubescent girls. They present this as evidence consistent with their theory, as women in the ancestral environment in their post and pre-reproductive years had less to lose, in terms of genetic progeny, by being raped.

Rape as a biological phenomenon

The book calls rape "a natural, biological phenomenon that is a product of the human evolutionary heritage..." akin to "the leopard's spots and the giraffe's elongated neck", which angered many feminists, including Susan Brownmiller, who discussed the book's findings with the authors on NPR.

The naturalistic fallacy

Thornhill and Palmer further state that they "emphasize that by categorizing a behavior as "natural" and "biological" we do not in any way mean to imply that the behavior is justified or even inevitable. Biological means "of or pertaining to life," so the word applies to every human feature and behavior. But to infer from that, as many of our critics assert that we do, that what is biological is somehow right or good, would be to fall into the so-called naturalistic fallacy." They make a comparison to "natural disasters as epidemics, floods and tornadoes". This shows that what can be found in nature is not always good and that measures should be and are taken against natural phenomena. They further argue that a good knowledge of the causes of rape, including evolutionary ones, are necessary in order to develop effective preventive measures.

References

1. Thornhill R and Palmer CT (2001). A Natural History of Rape: Biological Bases of Sexual Coercion. The MIT Press. ISBN 0-262-70083-2.
2. Coyne, Jerry (9 March 2000). "Rape as an adaptation". Nature. 404 (6774): 121–122. doi:10.1038/35004636. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
3. Ochert, Ayala (4 Feb 2000). "Times Higher Education - Why men want to rape". Times Higher Education. Retrieved 8 May 2011.

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