I would have NSA sex with a woman who is less attractive but still reaches some threshold of attractiveness, even if I wouldn't want to be seen in public with her or introduce her to my friends.

Women on the other hand will get into a relationship with a more average looking guy if he has other attractive qualities but for casual one night stands the guy would have to be hotter.

Does that sound about right? If so, doesn't this account for a lot of the issues discussed here? A 6 man will have casual sex with a 5 but try to wife up a 6. A 6 woman will have casual sex with 7s but will marry a 6 and feel like she settled. The 6 man has trouble finding a 6 woman because she's off having casual sex with 7s and 8s. So he's having casual sex with 4s and 5s which means the 5 men have trouble finding their match, etc.