Penises: The Bigger the Better?

Female preference may have driven the evolution of human males’ relatively large genitalia.

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Researchers asked women to judge computer-generated images of men.MAUTZ ET AL., FIG. 1Women rate images of men more highly the larger their penises are, according to a study published yesterday (April 8) in the Proceedings of the National Academy of Sciences. Penis size had about the same influence as height in determining how females rated the attractiveness of males. Body shape was also influential in determining hotness—men with broad shoulders and narrow hips faired best.

Researchers had 105 heterosexual female Australian women rate life-size computer-generated images of men of various heights, builds, and penis sizes. They found that, at rather short lengths, adding inches to penis size was hugely helpful, but the benefit per added inch began to diminish when penises reached around 3 inches long when flaccid. The researchers, from three Australian universities, predicted that there would be a size at which penises became too big but said that they had not studied big enough penises to reach that point. The longest penises they tested were around 5 inches long. Also, having a big penis boosted tall men’s ratings more than it boosted short men’s ratings.

The scientists said that women’s apparent interest in penis size could explain why ...

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