Male masturbation or sexual-auto stimulation is well documented in humans. This study dealt with the occurrence of masturbation in non-human primates in general, and in Japanese macaques Macaca fuscata in particular, from the perspective of behavioural ecology. In an interspecific comparison of 52 primate species, male masturbation was found to be a common behaviour that correlates more strongly to species that exhibit a multi-male multi-female breeding system than to species living in monogamous, one-male units, solitary or dispersed breeding groups. This result is in direct contrast to established theories of sperm competition, which predict that species with a higher risk of sperm competition i. They should not, therefore, produce and seemingly waste ejaculate by masturbating.
Here's How Sex & Masturbation Really Affect Athletic Performance
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