Why do guys like ass so much and why do girls try to show off their asses?

It's gross. What's so great about ass? Some guys will smell or even lick a girls asshole! Girls fart and shit from there all day long. If something smells or tastes terrible then what do people say? They say that it smells/tastes like ASS. So what's the big deal about a girls ass?
Why do guys like ass so much and why do girls try to show off their asses?

^^^^^^^^^^^^^ GROSS

Why do guys like ass so much and why do girls try to show off their asses?
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