The men who are fussier and looking for perfection either never actually get around to having kids, or they only have one or two. The guy who doent care and will lay anything and anyone has 17-odd illegitimate children, therefore his genes are the ones thriving and outnumbering Mr I-Need-The-Highest-Value-Woman-So-I-Will-Keep-Searching-Forever.

And then what? The seventeen bastards dilute the old guy's genes by being as promiscuous as he was, if they survive. Our genes don't survive if our clan doesn't survive. Clans that practice a K strategy do better than those that follow a R strategy.

The strategy that works is the one that reproduces success. That's why the alpha son of an alpha man wants a girl just like the girl who married dear old Dad.

Pointing to our paleolithic ancestors proves nothing. Their behavior is precisely what we have evolved out of. Where are the descendants of homo sapiens who mated with Neanderthals? (No, not the Republican Party, tempting a riposte as that may be.)