Gorillas (left) have small penises and small testicles, while chimps (right) have medium-sized penises and large testicles. He said that if a female is 'receptive to multiple males in each reproductive episode', it maximises her chances of getting high-quality DNA. 'It all comes down to the amount of competition the chimps, and their sperm, have when they mate with females.' 'Why the difference? Well for the testicles it's pretty straight forward. 'Amazingly the size of the reproductive organs, especially the testicles, are a reflection of how the apes are organised socially,' explained Professor Curnoe. Gorillas have small penises and small testicles, while chimps have medium-sized penises and large testicles.īy comparison, human males have the longest penis and medium-sized testicles.
#Gorilla penis siz series#
The relative size of the male reproductive organs across these species was discussed by evolutionary biologist Darren Curnoe in his latest 'How Did We Get Here?' video series for the University of New South Wales, Australia. Gentlemen, if you've ever been concerned about the size of your penis, take comfort in the fact that no matter how small it seems, it is one of the largest in the primate world.Īn evolutionary biologist has compared the sizes of genitals of humans to gorillas and apes to look at why there is such a discrepancy between the species.Īnd he concludes the human penis may have grown so long to make it more conspicuous to potential partners, or even as a way of cooling the body down. Human males weigh about half of what gorillas do, but studies peg average erect or flaccid-but-stretched penis length from 4.7 inches (12 cm) to 6.5 inches (16.7 cm).An evolutionary biologist has compared the sizes of human genitals to gorillas and apes to look at why there is such a discrepancy between the species
Male humans outgun any other primate species: For example, male gorillas can weigh as much as 400 pounds (180 kilograms), but their erect penis length is only about 1.5 inches (4 cm). The findings might help explain why humans have remarkably large genitalia given their average body size, the researchers wrote. Women with greater body mass per height were slightly more likely than thinner women to weigh penis size more heavily in their judgments of attractiveness, though the difference was small. Women's own features mattered as well, the researchers found: Taller women were more likely to find taller men attractive. It's possible that a larger penis just looked more proportional on a taller man's body, the researchers wrote, or it could be that women were biased against shorter men to the extent that even large genitals didn't help. When the researchers controlled for shoulder-to-hip ratio, they found that a larger penis had a greater effect on attractiveness for taller men. Shoulder-to-hip ratio was a major determiner of attractiveness, accounting for 79.6 percent of the variation in hot-or-not ratings. The results revealed that women preferred taller men as well as high shoulder-to-hip ratios (meaning that the wider the shoulders were than the hip, the more attractive the man). The computer simulations varied penis width in sync with length, so that all penises were proportional.
Height and shoulder-to-hip ratio have previously been shown as factors used by women to judge attractiveness. To compensate, the researchers, led by Michael Jennions of Australian National University, showed 105 young Australian women life-size computer-generated figures of nude men, varying the figures' flaccid penis size, height and shoulder-to-hip ratio. And in other studies, scientists have asked women to judge the attractiveness of male figures in photos with only penis size varied, when in fact no trait is ever evaluated in a vacuum, the scientists added. Men typically fret more about size than women, however, at least according to a 2007 review article in the British Journal of Urology International.īut studies have relied on questionnaires, which may not always glean honest answers, Australian researchers wrote today (April 8) in the journal Proceedings of the National Academy of Sciences. Studies on women's preferences for penis size have been mixed, with some suggesting that women who frequently orgasm through vaginal stimulation are the pickiest, perhaps because penis size matters for that sort of stimulation.
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