What is the reason girls don't want to look at naked guys?

A guy will look at a naked girl just about ANY chance that he's given! But, most often, if a girl catches a guy naked, no matter what the circumstances are, she'll scream and cover her eyes or quickly leave. Why don't they want to see naked guys as much as we love seeing naked girls? Is it something they're taught?

What is the reason girls don't want to look at naked guys?
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