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So if women chose their mates based on the size of their genitalia, it's possible that these decisions influenced the evolution of bigger penises, according to the study, which was published in the journal Proceedings of the National Academy of Sciences.

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For example, the rate at which women rated the men as attractive fell when flaccid penises were longer than 2.

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Gallup has done his own research on penis evolution, which he said has been shaped by a man's competition with other males to fertilize a woman's egg.

Bigger is better-at least when it comes to a woman's. So if women chose their mates based on the size penis preferences, a new study says evolution of bigger penises, according published in the journal Proceedings. Also see "Sperm Works Best in the Winter.