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Your BC (bulbocavernosus, now also known as the bulbospongiosus) muscle is split into two symmetrical parts that run along the middle line of the perineum. In guys, it encloses the urethra and helps to pump out its contents, especially during ejaculation. It also presses against the penis's erectile bulb – the lower part of the penis that extends into the body, past the scrotum – and can be flexed to provide a momentary "pump" of extra blood into an erection. In girls, it runs up just behind either side of the vulva, partly looping at the front-facing end of the clitoris. It presses against the clitoris's erectile bulbs (which extend down from behind the visible clitoral glans – the part usually referred to as the "clitoris" – to rest either side of the urethra and vaginal opening) and partly narrows the vaginal opening when flexed, which is why it is sometimes also called the sphincter vaginae or constrictor cunni.

When your BC muscle flexes, you'll feel it at the "front" as opposed to the PC's distinctive pull at the "back". Guys will feel it as a squeeze in their perineum, usually just behind the balls, or as a "pump" into their penis if done with an erection. Girls will feel it as a slight squeezing around their vulva, or else as a slight pressure on, "pump" into, or "pull" against their clitoris or clitoral hood, though the latter can often only be felt with a clitoral erection, and/or pressure from one leg being crossed over the other at a particular angle, hence the speculative tips for hands-free public masturbation that were at one time a Cosmopolitan staple.

Clenching the BC muscle can also be used to cut off your pee mid-stream by shutting the urethra directly (if you're a guy) or by indirectly moving along with your external urinary sphincter (if you're a girl). This is why those who've become used to using their BC muscle to delay or cut off peeing might mistakenly identify it as their PC muscle. After you've experimented with your PC muscle to cut urine flow as outlined above, try seeing if you can achieve the same effect with your BC muscle, noting how it's different to using your PC.

To review:

• PC (pubococcygeus) muscle: Felt at the "back", between anus and tailbone (but not anal sphincters directly). Supports prostate in guys and part of vagina in girls. Cuts off the bladder (and, in men, the prostate) from most of urethra as part of levator ani group.
• BC (bulbocavernosus) muscle: Felt at the "front", behind balls (in guys) or around/above vulva (in girls). Pumps out contents of urethra and presses against erect penile bulb in guys, constricts vagina and presses against erect clitoral bulbs in girls. Directly or indirectly cuts off urethra in both sexes, and is so sometimes mistaken for the PC muscle.

The kind of basic pelvic floor exercises (often dubbed "kegels" whether they're based on Arnold Kegel's work or not) that you can find all over the place don't tend to distinguish between the PC and BC – they just scoop pelvic muscles together into a bundle and then try to "improve" them by working them harder and harder for longer and longer. Girls on this particular treadmill are additionally marketed insertable rocks – sorry, Yoni eggs – Bluetooth-enabled vagina probes, or other hardware made according to the ancient Alibaba.com traditions of mass manufacture and then encouraged to work them out to absurd degrees.

Remember the introductory post, where in the replies I repeatedly emphasized not over-working your crotch, and the post before this one, where I emphasized completely relaxing the PC between squeezes? From painful penetration in women to premature ejaculation in men, pelvic hypertonicity (too much muscle tone) or otherwise being unable to control when the pelvic muscles tense/relax can cause a lot of sexual trouble. I cannot emphasize enough that this is not pelvic powerlifting; a "more is better" mindset here will eventually bring you to ruin.

#CrotchFit