Why do married women cheat?

So I know its not always and only married woman who cheat on there spouses but its just been a trend I have noticed in my life.

my mom cheated on my dad and now there separated. my god parents are not together anymore because the wife was unfaithful. and even a few of my friends have told me there parents or some married couples they know are divorced now because of cheating.

why is this so common? I mean if your single or in a open relationship have at it, but if your in a monogamous relationship why cheat on your partner?

now of course its not only woman who cheat. men have traditionally been the ones who were unfaithful. I'm just saying it seems like a current trend going on for married woman to be promiscuous. is this kind of a revenge thing for all woman who were treated badly or watched there father not be good to there mother? any views or opinions anyone will share?
Why do married women cheat?
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