What rape hysteria? Rape culture is where a rapist like Brock Turner gets a scant 6 months because the the judge says a prison sentence might have a bad impact on him.
*One* case does not rape culture make. Despite what you are led to believe, women are actually *safer* on college campuses than anywhere else. You often hear the 1 in 3 stat mentioned, but that stat is based on a piss poor study that's only quoted because it supports an agenda.
What's far more prevalent are the rape accusations, which is really no surprise when you think about it. Rape is a heinous crime, and folks that commit it are rightfully shunned and hated. However, what's happening is that the merest accusation can be enough to ruin someone's life ( men, not women incidentally ). As false accusers are rarely punished for their behavior, it creates a very effective tool for women to deploy against men. Think: Duke, Rolling Stones, Mattress Girl, and those are just off the top of my head.
In our culture of fear and snap judgments and "Dear Colleague" letters, you'd have to be crazy as a man to have sex on a college campus. Hell, you'd have to be crazy to even GO to college, seeing how an unsupported accusation would be enough to get you expelled. No, it's worse than that; not just unsupported, but an evidence refuted accusation can get you kicked out with no recourse.
Finally, you mention a rapist who got a light sentence. I agree that's wrong, but if you really want to be outraged about that I'd like to know your stance on the legion of women teachers who continually get suspended sentences or community service for sex with minors. It seems there's another in the paper every week, with kids as young as grade school.
Ironically, that may be where the real rape culture is; in our elementary and high schools.
As far as the younger generation not having as much sex; maybe the men are smarter than we were. They see that all the effort and time spent just increases their risk factor of having their lives ruined and are noping out. Smart.