why do we have butt cheeks i dont understand why did we evolve this way

what use do butt cheeks have 

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  27. close-to-the-knives reblogged this from mocha-fappuccino and added:
    so, the bigger the ass, the more evolved?
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  32. mocha-fappuccino reblogged this from tropius-paskewitz and added:
    that’s really all you got from that