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But evolutionary psychologist Gordon Gallup, Jr. It's not totally clear why women prefer bigger penises, but studies have shown that women prefer larger sizes because they can increase sexual satisfaction, Mautz said. In past studies, women have generally perceived tall men with greater shoulder-to-hip ratios as more alluring, making these factors important in how a woman judges attractiveness. 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. Also see "Sperm Works Best in the Winter. Theoretically, women in the early days of human evolution would have seen most penises in a flaccid state. What's more, studies using models of human genitalia have shown that deeper thrusting displaces more semen from a woman's reproductive tract than shallow thrusting. However, the relationship wasn't necessarily linear—i. Whatever the reason for large penises, this field of study addresses a question that some will find humorous, study leader Mautz acknowledged.

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