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So, according to the last studies, monogamy (for us, remember that evolution works differently between species) evolved as soon as mankind started to settle down in large groups.
At first man used to pick a harem, and that wouldn't be a problem with just 5 or 6 women in your social group.
The group would just stick together and live happily, no harm to no one.
When you get a group of over 30 people, though, simple mathematics can show you how STDs start to bother mainly promiscuous people.
Man is not that dumb, so people started noticing that the few that engaged more frequently in intercourse with many partners where the ones more happily to die because of infections, taking the partners with them eventually.
Since morality usually evolves basing on what's actually good for the society, monogamy became a thing, and STDs where controlled in this way.
So, ethologists claim human is naturally in for having an harem, though human society in larger groups has evolved to promote monogamy.
And you can even see the remains of the ancestral ways, just studying the smaller tribes and their moral codes.
It all comes down to simple mathematics after all.
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