That theory has been mostly shot down, noting that the frequency of rape as a reproductive strategy is not well correlated with sexual dimorphism in animals. Sexual dimorphism favoring males correlates with reproductive success gained by fighting other males, not raping females. The male scorpions you mentioned, for example, are not bigger than the females. Many aren't. Even many rapists can't do it - it's a fairly common cause of extra violence in rape, as the woman is blamed for the failure and beaten. Many rapists demand the women feign enjoyment. And many men can maintain an erection in the face, so to speak, of a sheep or plastic toy. Reproduction has little to do with that. Meanwhile: solitary, single event rape as a means of reproduction has a very low success rate even of initial pregnancy, let alone survival of the child. Willing promiscuity in a clan or small tribe works much better, with or without ritualized consensual dominance (proof of physical strength and competence), and explains the physiology much better as well. Humans don't reproduce by actual rape very well. It has the threat of rape used (often overtly) to control women going for it. It has organized programs of military rape going for it. It has the frequency of rape in non-reproductive circumstances (old,young, wrong gender, hadnicapped, imprisoned or victimized otherwise, etc etc etc) going for it. It has anal, oral, and object or instrumental rape going for it. And some of your arguments don't hold - the non-raping of rich and powerful women is only by those men who are less powerful than they are, and are vulnerable to revenge; their peers, who can gain power by rape, rape them at ordinary frequencies (but fewer of them means less often). If rape were for reproduction, a rich and powerful woman easily capable of caring for a child would be natural target one. They also say that the woman enjoyed it, quite often - at least until they learn not to say that, picking up cues from the therapist. Which means that most rape is, for most males, significantly consensual - at least in delusion, but that delusion is key. It is not human nature. That is no "feminist" teaching I ever heard in my life. It's the other way around - exactly what you would expect from attempted assertion of control (or ritual display of prowess to gain consent, for that matter, not a rape at all), not what you would expect from forced reproduction.