Researchers report today that penis size does matter to women — though within limits. Male genitalia evolve quickly. Biologists have puzzled, therefore, over what factors might have caused the human penis to become so large. For the latest study, researchers developed computer-generated images of males that varied independently in three factors: height, shoulder-to-hip ratio and penis length. A sample of heterosexual Australian women each viewed life-sized projections of 53 of the images and rated their sexual attractiveness. Too big to succeed? The data showed an upside-down-U-shaped curve for each trait. The women considered taller men with a more masculine body type indicated by a larger shoulder-to-hip-size ratio and longer penis to be more attractive, but not without limits — there were diminishing returns for extreme size, and men with substantially larger-than average features were not found much more attractive than those with only slightly above-average features. Mautz notes that this ideal size is relatively closer to the population average of 9 centimetres than are the predicted ideals for the other traits, implying that women prefer more extreme shoulder-to-hip ratio and tallness but less extreme penis size. Other researchers say that the findings are an important first step but fall short of showing a role for sexual selection in the evolution of human penis size, a point that Mautz concedes.


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