This is interesting, a old friend once said: "If a woman wants to cheat on you. She will cheat on you while holding your hand"

Now that the chauvinist statement is out of the way. Men cheat too. :)

I don't think anyone can say that monogamy has anything to do with raising children. I do not see why the barbarous requirement for having sex with one person needs to even be there in the first place. I don't have the same car for the rest of my life, don't drink the same thing or eat the same thing every day for the rest of my life either. Why not be able to taste other flowers in the garden as well. That does not mean i don't love or care about the mother of my child. As long as i take care of my responsibilities regarding my children. I see no reason why this requirement is imposed by society. Other than pure culturalism and brainwashing, which one could argue is indirectly the same thing.

Maybe it has something to do with possession. Maybe insecurity that my wife will like John's dick more than mine or love his Porsche more than my Buick. Don't you want to find that stuff out early about your partner vs later... Isn't your partners ability and her/his care for your children more important than who he/she wants to screw every once in a while. I definitely agree that if your partner is a nympho, well maybe you should not have stuck your dick in crazy to begin with or pretend to embody the white knight syndrome to it's full extent.

I think this "monogamy" business matters way more when the people in the relationship are unequal to begin with. If they are equal , financially for example, which i feel matters a lot when you are co-raising your children. You do not feel as betrayed because, as far as your hard earned resources are concerned, she/he is not taking any, only the children are. So who cares who your partners wants to screw in their off time. Which leads me to think of the next possibility, possession. My oh my, this person is mine and mine only. Lol It's 2017, we do not hit women over the head with cave man bats and drag them to our layers. But in some countries i guess we still do and we expect them to shut up when we tell them to and bring our beers over to the couch or else they won't get the credit card the next time they go to the mall. Wait, i just realized i just described some people i know. :) There are only a few feedback loops you can take advantage of. Lol

Parents can parent without marriage or monogamy. Why can't they?

This is leftover idealism imposed by the church and land-rights interest groups from ages ago. It just so happens it was enforced and people attempt to adhere to it. But obviously the statistics are against their success. The more women become equal and educated. The more divorce there is and the less babies get born. If those things are happening, i don't see any reason why changes in the family structure should not happen as well.

Usually a systems homeostasis usually communicates something about the nature of it's processes. The divorce rates should tell us something. Now that the gloves are off regarding divorce being taboo or being shunned by your social circle, this is if you are living in a country which does not look down on you if you don't want to put up with your partners bs anymore and leave. If you do, well clearly you are living someone else's life.