Why does every guy I date have a obsession with my butt?

since i was 21, my past few exes (4), all had a GREAT obsession with my butt. They can't stop staring at it or even touching it. The guy im dating now loves staring at my butt especially when im bending over. We went swimming and i was sitting on a towel and the next thing you know he is sniffing the towel.

Why does every guy I date have a obsession with my butt?
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