To a certain extent, it's common sense. Prior to the era of "hook-up bars" and loose sexual morality, there simply wouldn't have been as much opportunity for rape (at least of the kind that the discussion of 'rape culture' tends to focus around) to occur. Young men and women just wouldn't have been alone together unattended all that often.
By way of contrast, a massive, massive portion of social interaction in modern youth culture is either devoted to, or centered around, casual sex, and casual sex under unsupervised circumstances while incredibly intoxicated at that. Unfortunately, a certain degree of trouble in that environment is simply inevitable.
Yes, I do think that the modern "slut empowerment" culture plays a role in putting women at risk in this regard by encouraging them to enter those environments, while often downplaying the dangers that go along with them, or spreading the ridiculous idea that restrained and responsible behavior is a male responsibility alone. Modern sexual attitudes also cause trouble by encouraging young men to view women as sex objects, and often placing them under an inordinate amount of pressure to "score" at all costs.
Put simply, throwing aggressive young men, naive young women, and perception altering substances together unsupervised, while simultaneously encouraging "uninhibited" behavior, is simply a recipe for disaster all the way around.
Somewhere, somehow, someone is going to run afoul of a misunderstanding. If that misunderstanding is with just the wrong person, in just the wrong state of mind, someone is going to get hurt.
