system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: the entire “humans weren’t meant to be monogamous” argument falls apart when you take children into account.

I often come across discussions that center around the fact that now humans live such a long lifetime, monogamy is unrealistic and out-dated. But every study I have ever read on the topic of childhood seems to prove children have the best outcomes in a two parent home with parents who have a good relationship. 

I don’t see how this is compatible with the idea that marriage and long term commitment are passé. 

If, as a species, we thrive best when raised by a couple, there must be SOMETHING to the idea of marriage.
gpt
The idea of children needing a home with two parents is more of a cultural aspect of western society than something inherent.  There are other arrangements.  Some cultures take a more community rearing approach where the individual parents aren't so important and children will be raised as children of the whole village.  Another approach is to have stable polygamous relationships.  They will be similar to monogamous marriages but will have more people involved so the children have several stable parents rather than just the two.