The amount of women cheating from sometime around the 1980s ish to early 2000s increased along with men.
men cheat (generalized of course) in search for sex and unfaithful men often are as happy as a faithful man in a relationship
meanwhile women who cheat do it more for emotional purposes that are not provided by their husbands, leading them to be more distressed when cheating.
I read in the book an old lady had lived he whole life believing her husband was faithful, but it was not until he had passed away that she found out she was not the only woman her husband was seeing.
While women are now engaging in more sex
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