I didn't come up with this theory. It was given to me by a friend as an explanation as to why girls like guys' behinds. For some reason I never cared for that part of male body, thus never being able to understand the female fascination by the male ass...
I present to you the "Ass Theory": "Girls like guys' asses because ass has muscles that push the penis in and out during the intercourse. Therefore, the more muscular the guy's ass is the better he'd be in bed." Cute, huh? Of course, it's total BS, (well, almost total...).
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