As well as feeling darn good, masturbation may also help protect against sexually transmitted infections by flushing out the genital tract, at least in male primates, new research suggests.
Since examples of masturbation can be found across the primate evolutionary tree, stroking one's own erogenous zones is likely an ancient pastime that was passed on to all primate groups by an early common ancestor.
But that masturbation persists in so many species suggests pleasuring oneself may also have a specific purpose in and of itself. "Masturbation was also lost frequently in single-male mating systems, but almost never in multi-male mating systems," the researchersThis suggests masturbation may somehow be increasing chances of fertilization in competitive sexual scenarios.
If masturbation most often occurs before sex it would suggest it is improving male fertility, whereas after sex may indicate it's a sexually transmitted infection preventative. A 2010conducted on African ground squirrels engaging in post-sexual masturbation came to a similar conclusion.
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