In addition to all this, there is a very strong cultural thread of "The woman is responsible for controlling the man, who is otherwise uncontrolled." This is the underlying narrative behind everything from 'boys will be boys' to 'what was she doing there wearing that short skirt anyway?', the thing that backs up the idea that prostitutes, women who have casual sex, kinky women, and so on are unrapeable.

Consider the fact that a woman who agreed to a threesome with a couple of sports players was gangraped by a selection of the rest of the team, and some people's response was, "She agreed to have sex with two of them, what's a few more?"