Posts Tagged ‘perineum’

For a Closer Look (21) – BC Spasming

January 18, 2014

In the preceding post I was referring to the BC – among other important muscles – and its role while you are on your way to climax.

Now, the BC (Bulbocavernosus muscle) is directly attached to the bulb of the penis (that´s the internal base of the Corpus spongiosum, this being one of two erectile bodies of your cock).


It almost fully surrounds your erectile bodies:

BC at base

Because this muscle (aka Bulbospongiosus muscle) automatically contracts repeatedly when your ejaculatory reflex is triggered, it is thus mainly responsible for your milk shooting out of your penis and the force with which your cum leaves your cock as ropes, spray or spill. Also read this intro on Kegel exercises (about muscle strengthening).

I found a clip* in which a guy shows us his bottom while he makes himself pass his PONR. You will observe his BC-muscle spasming throughout the reflexive phase of his ejaculation (watch the area between his anus and scrotum!).

The following pic (showing the muscles I address here) is upside down from the original (shown recently), but that doesn´t matter, because this way it matches exactly the posture of the guy in the clip, you´ll see!

BC male turn

What´s more, you will find yourself running this short clip over and over! That´s because there are quite some POIs in the frame that deserve your detailed attention:

  • Watch his anus and the movement there as the guy clenches his sphincter-muscles!
  • Watch the involuntary clenching of his BC – the main ejector muscle – while the guy spurts his seminal fluids.
  • Realise the length of his great cock (extending inside of his body and well visible with the given point of view)!
  • Notice the tightness of his nut-bag!
  • Watch his milk being ejected in 10 spurts! The guy shoots a solid volume of his juice. You can make out a drip of precum at his cock-tip until he releases his load!
  • Last not least enjoy the audio-track!

This little clip is truly revealing. Since we tend to focus at the cum-shooting itself, we often miss the muscle-pulsing that makes the milk fly. Well, we could shift attention when our guy climaxes a second time, or when he eventually cums dry (after the depletion of his reservoirs).

But we always can sense his BC pulse when we touch him at his base during his pumping. This is as simple as it is hot to experience!

*Tech. specs: .avi, 3.2 MB, 22 sec., sound

Muscles for Joy

March 27, 2010

It´s time to take a look at the muscles which provide us with bliss, and the outside-world with our milk when we cum. And with it comes a revelation not short to uncover one of the biggest misunderstandings still prevailing today!

The muscles responsible for bringing up the male juices are organized in a quite complex system of muscular structures in the pelvis. However, only one muscle out of this many is mostly being referenced: the PC. Yet it is just one structure out of three making up of the Levator ani group. Nonetheless it is quite important, hence the famosity.

But it is the BC which is mainly responsible for shooting cum. Read the whole story:

… Indeed the pubococcygeal muscle (for concision often called the PC muscle) plays an important role in all these realms of self-pleasuring & erotic enjoyment. The PC as such is basically the band of muscle within the perineum, running from around the anus to the front & rooted around the genitals in from, anchored at both inner thighs. The famous “Kegel” exercises were first created to help women recovering from surgery or childbirth to regain better bladder control. It was soon discovered that both sexes could benefit from reguilarly exercising the PC. Sexual function can be enhanced tremendously by regularly exercising the PC.


However the PC is only one muscle involved in controlling urination: more crucial is a small inner muscle close to the bladder that controls both the flow of urine into the urethra & the release of semen. I understand that this is called the “bulbospongiosus” (correct me anyone, if you know a more proper term) commonly called the “pee stopper.” It’s what you contract or release when you’re unriating & you deliberately stop & start the flow of urine. Deliberately exercising this function can also enhance the ever finer-tuning of your erotic capabilities. This makes possible a more “advanced” form of ongoing orgasm that I won’t get into now…
– from a Yahoo Masturbation Group –

And this text (I found some time ago) eventually ends any guess-work concerning the muscles adressed here:

I guess it doesn’t really matter what you call the muscle you contract when doing Dr. Kegel’s exercise, as long as you do it correctly and consistently. However, being a stickler for accuracy, I have to point out that men contract a different muscle than women when doing Kegels and it isn’t the PC (pubococcygeus). It’s actually the BC (bulbocavernosus)[note: the bulbospongiosus is also referred to as bulbocavernosus]. This is probably the only place on the Internet where you’ll find this distinction [not anymore I guess]. Most will probably find it easier to “go with the flow” and conform to years of misconception by just calling it the PC.

Why isn’t it the same muscle? Men and women are different. Females have essentially internal sex organs, males essentially external. The PC muscle is located in such a way that it is above and behind the penis and it contracts up into the pelvis. While its action on the rectum may add a little to the pull on the penis, it isn’t the main muscle being exercised when men do Kegels. Of course men can contract their PC muscle. They do it every time they have a bowel movement. Some probably contract it while doing the Kegel exercise (by involving the anal area), but it isn’t necessary to do so for a stronger penis.


In the male, the two halves of the BC are joined in a “herringbone” pattern surrounding the bulb of the penis (the internal base of the corpus spongiosum). The BC muscle has two main purposes. One is to force liquid (urine or semen) out of the urethra. It does this by way of the herringbone interlacing of muscle fibers which, as they contract, milk the urethra toward the meatus (opening at the tip of the glans). It also happens to cause the penis to be pulled into the body (the LOT tug-back). This happens every time a man urinates. It also happens with much greater force, and with rhythmic contractions, when he ejaculates. The BC muscle is the main ejector of semen. This is why ejaculation improves by exercising it.

The other function of the BC is to squeeze blood into the corpus spongiosum and the glans. The bulb of the penis is a reservoir of blood. At the time of greatest arousal voluntary or reflex contractions of the BC and Ischiocavernosus muscles force blood into the corpora. The Ischiocavernosus muscles surround the crura of the penis (legs of the corpora cavernosa). With both sets of muscles contracting on the base and legs of the penis, a maximum erection is achieved.

Locating the BC: The adage about stopping the flow of urine is valid in locating the BC muscle in men. Even though the urethra does have a sphincter (just below the prostate) to stop urine flow, contraction of the BC will “milk” the urethra and let the man know which muscle to use for Kegel’s exercise. The BC muscle can also be felt with the fingers by placing them between the scrotum and the anus. Contractions felt through the skin at this point (in the midline) are from the BC muscle.


Searching the Internet for instructions on how men should do Kegels will bring a wide variety of exercise plans. Some say start with 20 at a sitting, twice a day, and work up to 100 doing them daily for six weeks. Another site suggests working up to 300 per day, holding each contraction for a few seconds, and doing that many every day “for the rest of your life.” There’s no set answer. Each man must evaluate his situation and exercise accordingly. The plan that starts out gradually, with a few quick squeezes, and work up to a hundred holding each one for a few seconds, sounds like a good one to start with. A few days a week should be enough to evaluate your situation. If you don’t notice a change in the force of your ejaculations or the strength of your erections, then more exercise of the BC, not PC, might be in order.

Staying relaxed while heating up (2)

March 24, 2010

Yeah, staying relaxed on the way to climax is a basic method to get involved into edging, which is foremost: prolonging the sex-act. Secondly the relaxing mode is promoted as to fight premature ejaculation. I found this explanation somewhere on the net:

To make sex last longer, relax your PC muscle. As soon as sex begins, relax this muscle and keep it relaxed throughout. This will help you to stay away from orgasm and avoid premature ejaculation.
However, its natural to tense this muscle during sex because it feels good. If you do tense it, you’ll get to orgasm quicker. So, to last longer, relax your PC muscle from the moment of penetration [or any other penile friction] onwards, and keep it relaxed. You can practice this with your partner although you will learn much quicker on your own first, while masturbating. Learn what it feels like to focus on relaxing the muscle.

The technique works because the PC muscle sits right beside the prostate. The prostate plays a central role in orgasm and ejaculation. When the PC muscle is tensed, it puts pressure on the prostate and brings orgasm quicker. Relaxing your PC muscle reduces pressure on the prostate and helps avoid premature ejaculation. It also reduces pressure on the surrounding organs, the seminal vesicles and the ejaculatory duct, both of which play a central role in orgasm and ejaculation.

You can see the direct effect pressure plays in orgasm control yourself. Try masturbating with one hand and use the other to put some pressure on your perineum. Notice the difference? It feels better and you’ll come to orgasm quicker. That’s because you’re physically squeezing your PC muscle with your fingers, and indirectly, your prostate.

Traditionally, sex lasts only a few minutes before the man orgasms. As soon as penetration begins, the man tenses his PC muscle (usually without noticing) because it feels good. Moments later it’s all over. By relaxing your PC muscle, pressure is taken off the prostate, orgasm is delayed, and premature ejaculation is cured. The aim of longer sex is to stay away from orgasm.

Well, it is a bit more complex than expressed here. And there is clearly a mix-up – once again – of orgasm and ejaculation. Then there is this muscle thing. Soon I will focus on this theme. Before I shall have a word about conscious ejaculation. In my next post.