Chimps have more competition so produce larger numbers of sperm, but gorillas have a hierarchy so they don't need as muchīut he said there wasn't a discernible reason why there is so much variation in penis size between humans and great apes. For testicles, this difference is explained by how societies are organised. 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. 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. 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
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