I believe it's because their male ancestors could only mate with low quality women who were carrying someone else's baby as often as their own. Since these low quality men were only capable of mating with low quality women, they lack the aversion that higher quality guys have for easy women because they were able to snag higher quality women who were less likely to cuckold you.
Yeah, I've seen the pictures of 'men' wearing "proud cuck" on their shirt. They look... exactly like you'd expect them to. But it's just so sick, it's disturbing to try to wrap your head around.
There's another possibility though. I liked easy women a lot when I was younger (as most men do) for the obvious reasons. Crazy women are the best in the sack bar none. Some men might confuse "we have wild sex 8 times a day" with "this is a good mate choice". But the sad, sad reality is that you just can't have both unless you have a wife and a paramour.
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