Why do some guys brag about cheating?

I hear some of my guy friends brag about how they made out or got a BJ from another girl even when they've been in a relationship with their girl for 7 months! Why do some boys brag about this? Isn't it something they should hide? Guys RARELY brag about cheating so when they do do it, Is it because the girl they cheated with is hotter than his actual girlfriend so he wants everyone to know?
Yes. She's most likely hotter
No. She's most likely uglier
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Why do some guys brag about cheating?
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