Why do people cheat on their partner with someone less attractive?

Why do people cheat on their partner with someone less attractive?

Seems weird, but I saw it happen more than once - a woman I know cheated on her husband with a much more overweight, balding guy; and likewise another guy I knows cheated on his gorgeous wife with a total butterface.

My wife and I often joke that if we really must cheat on one another, at least to go for much more attractive people, at least it would be somewhat more palatable!

Why do people cheat on their partner with someone less attractive?
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