So many different answers to this question, and none of them are right or wrong.
One argument that anyone has yet to suggest in this thread is that of genetics. There are some scientists who whole-heartedly believe that we as a species are physically designed to "cheat" or have multiple sexual relationships. Look it up some time, some of the evidence is pretty compelling.
I'm not so sure I'm totally convinced, but it's an interesting viewpoint nonetheless.
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