These gentlemen's opinions and conclusions should be rejected out of hand of course, but they should be pitied for wasting their time deluding themselves. Gregory Dyas R ape is not even particularly good strategy for fertilization, as the human male does not have a strong indication of when the female is fertile. The best reproductive strategies requires the male have exclusive access to the female during her entire menstrual cycle, thus guaranteeing that he will be the biological father to the child. This gives us a valid evolutionary psychology explanation to much of human reproductive and sexual behavior, from going steady, marriage, harems, to the traditional honeymoon. The fairly continuous sexual availability of the human female keeps the man around, even during pregnancy and nursing.
Rape destroys relationships and weakens societies.
Remember how rape was used in Bosnia as a weapon to destroy Muslim society. When excluded from society, the rapist has fewer opportunities to pass along his genes. Therefore, the gene that selects for the tendency to rape fades into the background, because it isn't passed along as readily, while the gene that selects for either monogamy or promiscuity becomes prominent, because these are more socially acceptable methods of passing along genes from one generation to another. Darwinian evolution does not exist in a vacuum when it comes to the human race. Whether Thornhill and Palmer want to admit it or not, society plays a role in behavioral evolution.