Its human nature. Its not natural for humans to stay with one partner we evolved in small communities where there were no husband and wife, everyone in the village had sex with each other, that way they took care of each other even closer, kids included. Sex is a great thing, its natural stop acting like a puritan. Religion is the reason society is fukked up.
Men naturally want to spread their seed and are physically equipped to do so. Women are meant to get seeded and give birth.
No....just no.....the problem with your theory is once the woman got pregnant, no man would stick around to raise her babies because she had been fukking everybody and there would be no way for the man to verify the kids were his. Basically like now.....except b*stards and whores were completely ostracized by all men in antiquated times
