(Women) are more psychologically victimized by casual sex than men are, because men are hard-wired for casual polygamy, whereas women are hard-wired for monogamy.

This. Women are wired to need their mate to STAY. That goes back to the caveman days. If he pumps and dumps, she could be left alone with a baby to raise - and that would have been a death sentence for both of them, with no caveman to hunt meat for them and protect them.

Some women can do casual sex for a while, but then the repeated rejections take their toll and she becomes unable to handle it when he leaves. Plenty of women have been labeled as "crazy" when the real problem is that the casual sex has started to feel real, real bad.