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If you're craving gay XXX movies you'll find them here. This post is part of Mashable's Masturbation Week. 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. 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.

But, have you ever wondered why they happen? Mashable spoke to scientists, medical doctors, clinical sexologists, and sex educators to get to the bottom of what your body's getting up to while you're pleasuring yourself. After you're done masturbating, it's often nigh-on impossible to urinate, even if nature's call feels really quite urgent.

So, what's up? Myrtle Wilhite — a physician specialising in sexual health — says this is something that affects people with penises and vaginas because the "same neural arousal system" controls the bladder and "moderates the process of sexual arousal. Fancy getting into the nitty gritty? OK, good. According to Dr.

Jennifer Swann, professor of Biological Sciences at Lehigh University, orgasm is controlled by both the parasympathetic and sympathetic nervous systems. Vasocongestion is a fancy word for the swelling of tissues in the genitals during sex, as a result of increased blood flow. Meanwhile, the sympathetic nervous system is in charge of retaining urine in the bladder to make sure you don't like, pee when you're having sex or — if you have a penis — when you ejaculate.

Clinical sexologist Lawrence Siegel says "the body really tries to keep these functions separate" because "uric acid is the main constituent of urine besides water and can easily damage sperm if they make contact. This is a peculiarity experienced by people with testes when they're masturbating. Per Dr. Amin Herati — assistant professor of urology at the Johns Hopkins University School of Medicine — during arousal, "the cremaster muscles that surround the testes start contracting.

Siegel says that the swelling and ascension of the testes is "necessary to achieve full expulsion or ejaculation. As this happens, the cremaster muscle contracts and the testes are drawn up closer to the body.

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Well, the TL;DR version is this: people with vulvas can have multiple orgasms, and people with penises usually cannot. Carlin Ross — sex educator at the Betty Dodson Foundation — says: "Women are bottomless pits of sexual pleasure because we can orgasm, and orgasm, and orgasm. Not all people with vulvas identify as women, of course. So, why is this?

According to Swann, people with vulvas don't have a post-coital refractory period, which means that they remain sensitive to sexual stimuli and can achieve further orgasms. Alas, people with penises aren't typically able to achieve multiple orgasms in a short span of time. This is because they have a refractory period, the period of time it takes to regain sexual sensitivity. Sex educator Bianca Palmisano says scientists aren't percent certain why this happens, but some hypothesise that the refractory period is regulated by hormones like like oxytocin and prolactin.

Swann says some research has suggested that this refractory period can be "influences by the senses or cognitive factors. Have you ever looked down at your chest after orgasm and seen a red blotchy rash appear?