By Rachel Thompson May is National Masturbation Month, so we're celebrating by exploring the many facets of self-love. Cast your mind back to the last time you cracked one out, knocked one off, rubbed one out, masturbated — whatever you call it. You may well have noticed a few rather curious physiological responses that occurred in addition to your own personal pleasure party. How mutual masturbation can help close the orgasm gap Things like getting a rash across your chest after you come, one of your testes ascending while you're jacking off, or not being able to pee afterwards. Granted, we're often far too preoccupied with our own arousal to pay heed to a lot of these little biological quirks.