serious answer: birth control + social safety nets = promiscuity. Also, promiscuity + hypergamy = competition between women for the top 10% of chads, and they compete by being slutty.
Long answer: In the past, no birth control mean that promiscuity had an obvious consequence: bastard children. And the lack of welfare programs meant that a bastard child was a real problem. As a result, women controlled themselves, and most of them waited until marriage to have sex.
Now that women don't have to wait (because there's no longer any negative consequences) they can fuck whomever they want, so they're fucking exclusively chads. To be fair, you'd do the same if you fuck any woman - you'd fuck the hot ones.
Hilariously, women are still following their instincts. They're attempting to lock-down men by creating a bond with them through sex. I'm sure that strategy works in a tribe of 50 individuals, with no birth control etc. But in the modern world, it doesn't work. Chad doesn't bond with you because you let him dump a load in you. He ghosts you.
So now, these promiscuous hypergamous women (foolishly) attempting to lock down chad by offering him sex are in a situation where they are competing with each other for those few top 10% men. This leads them to get more and more slutty in the hopes of getting chad's attention.
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