Why do men look at naked people?

Why do men look at naked people. don't you find it creepy or weird.
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I want to understand this more in depth because it makes me feel like I am not entertaining enough or that I am not pleasing. I personally believe that your body is personal and sacred and is only meant for your eyes or your partners eyes I guess in a way I feel cheated on.
Why do men look at naked people?
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