[during a lecture on why women today supposedly prefer more feminine men]
If you track women through their Ovulation cycle and you show them a picture of a man same man, and you do nothing but vary his jaw width when they're ovulating the guy with the wider jaw is more attractive and when they're not ovulating and the farthest away from that the guy with the thinner jaw is more attractive and that's associated with testosterone levels, so women who are fertile like more masculine men. If you’re on the pill, then you’re never in that ovulation phase, and so one thing that may have happened, and I don’t know this for sure, is that since women have been taking birth control, their preference for less masculine men has been more pronounced. And that could be one of the things that’s fueling the tension that’s existed and exists now politically between men and women.
[Peterson later goes on to talk about how sex is dangerous socially, emotionally, and about how AIDS could have killed all of us when it emerged in the 1980s]