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"I'm curious about the long-term genetic impact of monogamy vs polygamy."

I think you might be overlooking the fact that women can and do have sex with other men than their husbands.

It's a complicated issue certainly, however as far as I'm aware cuckoldry (where children are product of adultery) is relatively rare, under 2%, don't have a source offhand but that's the hearsay as it were.

I think the implications were about sex before marriage, not just actual cases of having another persons child.

Rates of births out of wedlock has been steadily increasing and is nearing 50% (may already be passed it).

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