Cock pussy sperm competition

Results from a second questionnaire revealed that upon first being sexually reunited after time apart, couples engaged in more vigorous sex— amely, compared with baseline sexual activity where couples see each other more regularly, vaginal intercourse following periods of separation involved deeper and quicker thrusting. Evidence of long-term effects of suckling deprivation? The Handbook of Evolutionary Psychology 2nd ed. First, despite variation in size between individuals, the human penis is especially large compared with that of other primates. Physiological evidence, including testis size relative to body weight and the volume of sperm in ejaculations, suggests that humans have experienced a low-to-intermediate level of selection pressure for sperm competition in our evolutionary history. Those primates that have multi-male mating systems tend to have bacula that are larger in size, in addition to prolongation of post-ejaculatory intromission and larger relative testis size.

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