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The Evolution of Human Mating. There are certain genes, like homeobox Hox a and d genes, which may have a role in regulating penis size. A Guide to Ancient Greek Drama. American Journal of Diseases of Children. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body. A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15 men". The following staff-measured studies are composed of different subgroups of the human population in other words, specific age range or race; selection of those with sexual medical concerns or self-selection that could cause a sample bias.

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