Human sperm competition: testis size, sperm production and rates of extrapair copulations
@article{Simmons2004HumanSC, title={Human sperm competition: testis size, sperm production and rates of extrapair copulations}, author={L. Simmons and R. C. Firman and G. Rhodes and M. Peters}, journal={Animal Behaviour}, year={2004}, volume={68}, pages={297-302} }
We examined the claim that sperm competition is an important selection pressure operating in human populations. [...] Key Method We recruited 222 men and 194 women to complete a survey of their sexual behaviour. Of these, 28% of men and 22% of women reported engaging in extrapair copulations (EPCs). A review of the literature suggests that rates of extrapair paternity are in the region of 2%. These values suggest that the risk of sperm competition in humans is relatively low, in line with comparative studies of…Expand Abstract
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