Dear Prudence: Is penis size hereditary? Because my brother’s is quite different. - Father vs son penis size
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That said, according to Paduch, most men in a family do tend to share a similar dick length and shape. “If a father has a bigger penis, the son's. Yes, penis size is hereditary, a product of genetics. the size of that penis is a joint genetic effort between mothers and fathers. it's possible for one son to inherit size genes from one X chromosome, and one from the other.