I think that there's a lot of anxiety more than puritanism. There's a lot of reasons, but one of them is certainly the growing political divide; women are trending more and more liberal, and men more and more conservative. Women don't want to get trapped by a man that doesn't think that she should have rights, while men seem to think that they are 'owed' a woman to have their babies (...and how are they going to fucking pay for those kids, when they think their wife is going to stay at home, and they have zero fucking job prospects...?).
TBH, if I was a woman, I sure as fuck would not want to risk dating men right now.