Why do men sometimes cheat with a woman far less attractive than his girlfriend?

Anonymous
This might sound mean/harsh. But why do men sometimes have a pretty girlfriend, but end up cheating on them with someone who isn't as pretty as the girlfriend or someone who is jealous of their girlfriend? Wouldn't it make more sense to cheat "up" in terms of looks if they are going to cheat? Cheating is wrong anyway, but I'm just wondering why they would cheat with someone far less attractive. Guys, can you answer this?
Why do men sometimes cheat with a woman far less attractive than his girlfriend?
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