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Bottoms
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I have a strange question...why do our bottoms have a big crack down the middle? Why isn't it a smooth surface with a little bum hole, and what reason do we have bum cheeks that stick out and are cushiony????
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For more on marking an answer as the "Best Answer", please visit our FAQ.It has, primarily, to do with the anchoring of the gluteal muscles and other structures that allow humans to stand upright and walk. The gluteus maximus is the largest muscles in the human body. By the way, the beginning of the cleft at the top of the separtion ("plumber's crack") was once called nock... same as the nock of an arrow where the bowstring sets...