If I remember correctly 23% of norwegian males under 40 are childless while only 13% of females are childless.
And that is for having children; I'm sure in the "casual dating"/monopolising the most fertile/attractive years of women the top males have it much better.
I don't get it. You can't "monopolize" anyone as far as casual encounters are concerned, since they're by definition 'casual', i.e. temporary, non-exclusive, short-term, etc. Or are you implying that each man in that supposed top 10% has literally eight women waiting in line for him and abstaining from any other kind of encounter? That's a quite bold statement and not one I've verified from personal experience. But then I don't live in America?
I would guess that is an extremely low difference compared to historic norms. 8,000 years ago, women were 17 times as likely to have children[1], your example would be about 1.13 times as likely.
