"The parasympathetic system is irresponsible for dilation of the vascular system with allows for vasocongestion," says Swann. (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.
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".
Swann says this rash occurs due to vasocongestion, which not only results in blood flow increasing in one’s genitals, it also occurs in "other parts of the body and skin".
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. ) "When you keep going, you hit new levels of pleasure building on your orgasm energy and riding the waves until you’re a heaving, sweaty mess". So, why is this?
"Places which have been injured often have an altered blood flow pattern as the result of the injury, so you might be noticing that throbbing more," says Wilhite.
Ross says that direct clitoral stimulation sometimes feels too intense because you may have "already had a small orgasm and didn’t recognise it," or you might need "more lubricant and less pressure".
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.
Ross says the rash is caused by the "blood vessels in your skin dilating from the orgasm".
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".
He says that as sexual arousal increases, vasocongestion makes the testes start to swell.
Swann says that the clitoris "expands with blood and becomes very sensitive" as stimulation progresses.
"This reduced sensitivity lasts until the body has regained sensitivity to sexual stimuli," says Herati.
"The simple answer is that sexual arousal prevents urination," says Wilhite.
Wilhite says "genital tissue, specifically the clitoral structure, becomes filled with engorged blood and swells under the skin".
All the puzzling things that happen to your body when you masturbate, explained by science https://t.co/OO0EaSvFsW— Mashable (@mashable) September 8, 2020