My answer to From a personal and emotional point of view, why do so many value monogamy?
Answer by Viktor Leberecht:
Science tell us that firstly mongamy is a cultural norm in western societies, not so much in others, about 80 % of societies allow for non-monogamy.
Secondly in humans it seems to be a form of mateguarding.
Last not least, Science clearly tells us that we are not by nature monogamous.
Two books about this that gather the scientific evidence are by Prof. David P. Barash, a world renowned psychologist and zoologist:
The myth of monogamy (written with his wife, a psychologist) from 2001, gathering evidence from research about animals and humans
Out of Eden, focussing exclusively on human beings, from 2015
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