[jakethebake]

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For a more serious answer. . .

I suspect it had something to do with social stability. Certainly a woman wants one man so he protects her. Typically men would want more than one woman, but maybe it works better if it's one for one? I imagine if too few men had too many women the woman-less men would become unruly.

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Possibly, but doesn't this screw with natural selection? If there's polygomy then only the best are breeding, while the less-desireable are not. And the less-desireable are probably to wimpy and/or stupid to be too unruly if the others slap them upside the head for it.