What are men thinking when they check out a girl's butt?

Anonymous
Guys check me out all the time. No, I don't wear provocative clothing and yes, I am attractive (not meaning to sound presumptuous here), which explains why men stare and how I don't provoke the act.

I don't understand what men are thinking when they stare.

Guys, can you help me out by answering this question?
What are men thinking when they check out a girl's butt?
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