But those women may have felt pressured to say the politically correct thing: That size doesn't matter, said study leader Brian Mautz , a biologist at the University of Ottawa, Canada. Since early humans didn't wear clothes, male penises were obvious to women. Also see "Sperm Works Best in the Winter. 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. The findings suggest that female choice may have driven the evolution of larger penises in humans. Theoretically, women in the early days of human evolution would have seen most penises in a flaccid state. Therefore, "long penises may have also evolved to deposit semen in the deepest and more remote parts of the vagina to promote more effective sperm retention," he said. For one, previous studies have shown that "the flaccid human penis is an imperfect indicator of the size of the erect penis," said Gallup, of the State University of New York at Albany, who was not involved in the study. Women rate greater shoulder-to-hip ratios as more attractive in addition to larger penises.
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