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Your Scrotum Would Have Been Labia if You Were a Girl. Homology happens when two body parts have a shared ancestry. Basically, your scrotum is made out of the same stuff as labia--they just form into different parts when your sex organs start differentiating in the womb. During the process of sexual differentiation, the cells decided to make a sack instead of lips. 
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A Few Interesting Facts about the Male Reproductive System (13 pics + 1 gif)
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