Now screwing students is very risky for teachers because they could get fired. But it still goes on. No professor can have any relation with a student now. That rule hit graduate students especially hard because students were their only source of dating. A lot of good relations, a lot of marriages come out of those relationships.
Sex becomes turbulent and highly energized at times when other things become highly energized.
It is a Reichian point of view. D.H. Lawrence has the same path. It's all one flow, if you suppress it at one place the whole culture is affected. I think the people in charge of the culture know that. Sex can be used as a control mechanism.