[eleni121]

Polygamy makes biological sense

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Not if leads to an excess number of males who then are more aggressive and warlike and thus leading to population extinction. History has shown that primitive peoples who do practice polygamy do not do well.

[Laissez-faire capitalist]

In polygamous societies, many males having multiple mothers and competing for the attention of the one father for some reason leads to warlike tendencies. This has been shown in multiple socities.

[lady lawyer]

I think polygamy has sometimes followed wars, when males became scarce. In any event, sex has an obvious biological purpose, which can be served in polygamy, but not in homosexuality. Just because two people have an unnatural urge to imitate intercourse with a person lacking the wrong plumbing, it does not mean that society has to allow them to imitate marriage.