Well let me think, I have not killed an animal with my bare hands, in a long time although agression is a part of survival, and my turf wars are mostly limited in these forums, although defining territory is part of my survival.
Of course the answer is not that simple but I fail to establish a link between agression and sexuality. I can see a link between agression and the need for procreation, as in kidnaping women of the other tribes, but I cannot see a link between sexuality and punishment (because that what rape is mostly about) which does not cut through pathology.
And I do not thing that procreation is the ultimate goal of rape.
Now you could argue that malr agression, as an inherited biological charachteristic, manifests itself in some circumstances pertinent to sexual violence. But why since we can control our other male agressive urges this should be singled out?
I think that taking into account the objectification of the female body (as in the Japanese porn bondage culture, or the whole S&M scene) you will find some answers. Look also in the direction of rapes commited by combattants of various countries.
Rape as mean of ethnic cleansing holds more species-related water than the civilian rape, although I have to say that then rape is just a pretext for genocide.Or the inverse?