The Evolutionary Advantages of Masturbation in Primates

Masturbation is an ancient trait in primates, and at least in males, it increases reproductive success and helps to avoid contracting sexually transmitted infections (STIs), according to new research. The study found that masturbation has a long evolutionary history among primates and was most likely present in the common ancestor of all monkeys and apes. The research also found that male masturbation has co-evolved with multi-male mating systems where male-male competition is high and high STI load across the primate tree of life. The significance of female masturbation remains less clear.