Human butts do float. They’re where a lot of fat in the body is stored, and fat is less dense than muscle, so they’re one of the floatiest parts of the human body.
In fact, when floating corpses are found, men’s corpses are generally found floating face-down, because the floatiest part of a man’s body (assuming he’s not obese) is the butt. Women are generally found floating face-up, as the boobs are usually floatier than the butt.
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