Trigger warning: more mechanical discussion of nonconsensual sex.
The odds of insemination are lower
On a per-act basis, rapes are about twice as likely to result in pregnancy than consensual sex. I suspect that you're right that various fertility-boosting measures don't happen during rape and this effect is due primarily to selection effects (who rapes, who is raped, and when the rape happens), but the net result is still that rapes are a decent reproductive strategy (if the rapist can get away with it).
Rape has been prevalent throughout human history, but forced copulation doesn't seem to be a leading or even closely-tailing human reproductive strategy.
This seems really unlikely in the context of marriages before the Enlightenment, or in the context of wars and raids (where women were a resource like any other).
On a per-act basis, rapes are about twice as likely to result in pregnancy than consensual sex.
Yes, in America. We also frequently do our best, when having consensual sex, to minimize our odds of having kids. (I was unable to find rates of birth control use during rapes, unfortunately.) In the ancestral environment, this would probably not be a factor.
One of the lessons highlighted in the thread "Less Wrong NYC: Case Study of a Successful Rationalist Chapter" is Gender ratio matters.
There have recently been a number of articles addressing one social skills issue that might be affecting this, from the perspective of a geeky/sciencefiction community with similar attributes to LessWrong, and I want to link to these, not just so the people potentially causing problems get to read them, but also so everyone else knows the resource is there and has a name for the problem, which may facilitate wider discussion and make it easier for others to know when to point towards the resources those who would benefit by them.
However before I do, in the light of RedRobot's comment in the "Of Gender and Rationality" thread, I'd like to echo a sentiment from one of the articles, that people exhibiting this behaviour may be of any gender and may victimise upon any gender. And so, while it may be correlated with a particular gender, it is the behaviour that should be focused upon, and turning this thread into bashing of one gender (or defensiveness against perceived bashing) would be unhelpful.
Ok, disclaimers out of the way, here are the links:
Some of those raise deeper issues about rape culture and audience as enabler, but the TLDR summary is:
EDITED TO ADD:
Despite the way some of the links are framed as being addressed to creepers, this post is aimed at least as much at the community as a whole, intended to trigger a discussion on how the community should best go about handling such a problem once identified, with the TLDR being "set of restraints to place on someone who is burning the commons", rather that a complete description that guarantees that anyone who doesn't meet it isn't creepy. (Thank you to jsteinhardt for clearly verbalising the misinterpretation - for discussion see his reply to this post)