[nradov]

Monogamy is somewhat recent as a norm in human societies. DNA analysis shows that in ancient times, far more women than men had offspring. Many of the men died young and/or were kept as slaves. This type of society can be stable for a long time — until the slaves revolt.

https://psmag.com/environment/17-to-1-reproductive-success

[icegreentea2]

I would not argue that such a society cannot persist for a long time. I would argue that monogamy(ish) is more stable, hence its success.