Girls, what constitutes a "nice butt" on a guy?

Anonymous
I've seen so many girls talk about how certain guys have "nice butts", but they're very unspecific about what actually makes it nice.

It makes me think that these girls don't actually care about butts at all--they just like the guy, so they like whatever is attached to him (including his butt)
Girls, what constitutes a "nice butt" on a guy?
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