I don't deny there may be rape in everybody's family tree if they go back far enough, but "society" is needed for human survival, and "society" does not persist when the mating doesn't make a mate, but makes an enemy instead.
As long as there have been humans, there have been stern codes, conventions and customs --- plus, as far back as we can reach via historic records, commandments --- about whom you may approach for intercourse, and whom you may not.
And generally not only "whom," but where, how, and why.
Violators were considered just that: violators. In many tribes they'd be dealt with by recognized legal avengers: the violated girl's father or brothers or betrothed.
A femme sage with poison. Or a priest with a sword.
Nice comforting screed but biologically and historically inaccurate.
http://www.freerepublic.com/focus/f-chat/3238126/posts?page=15#15<
Humans form far more complex societies than animals do. When Homo sapiens assumed a fully upright stance, the changes in the female's reproductive anatomy (narrowing of the pelvis, etc) plus the relatively large head of the 9-month fetus combined to set up the delivery of the offspring at an extremely immature stage. (A calf can walk on its own 30 minutes after it's born: a human can take a year or more. At 30 minutes the human can't even lift its head.)
This means every parturient female needs a social structure: not only her mate but her sister, mother, brother, whoever --- and even in primitive societies often more elaborate than that.
The vulnerability of the mother/child dyad is the source of marriage and family, which are manifested in every human culture because of decisive evolutionary selection pressure: those who didn't, didn't survive. And marriage and family --- with all the restrictions on sexual coitus that that implies --- are the source of all further elaborations on human society: the source of kinship, clan, culture and civilization.
If you don't have that, you might as well be bonobos. Brothers.