You could talk about it in terms of sociology or psychology or whatever you like. I'm merely thinking about it in terms of the benefits it passes onto your genes to have that strategy when dealing with those sorts of situations (and obviously humans can rise above that, as evolution is far from everything there is, especially when you know about it).
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Re: •Men more likely to stick with girlfriends who sleep with other women than other men
http://en.wikipedia.org/wiki/Evolutionarily_stable_strategy