Why men are obsessed with my ass?

I don't understand. Whenever I enter somewhere all the men starts to look at my ass. I put a camera at my back pocket and there was six men looking at my ass only in a quick grocery trip. My boyfriends hand is like a piece of metal and my ass is a magnet. Why guys are obsessed with my ass? Not just mine any girl with a big ass. What is so good about big asses?
Why men are obsessed with my ass?
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