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Ejaculation. As you all know, ejaculation is triggered when the male is brought past a certain level of arousal. What you may not know is that this event is a reflex, just like the knee jerk ! Despite the complexity and the number of steps involved, ejaculation is truly an autonomous series of event out of the mind’s control : once set in motion, ejaculation will complete no matter what, each step triggering the next one.

Some might argue that they can stop themselves from ejaculating. This is only partially true. A more appropriate description would rather be that they have learned to abort the process rather than control it. Since each event triggers the next, one can learn to “throw a wedge in the gears” when the machinery is set in motion, but this does not invalidate the fact that it is an autonomous reflex. As a quick proof, one needs to recognize that every step that have already occurred cannot be fully recovered without first going through the refractory phase : what is done is indeed done. Of course, as long as the initial trigger point has not been exceeded, one may stop and go as desired to surf on pleasure : this is the basic idea behind edging.

The ejaculatory mechanisms consist of three stages: emission, ejection, and evacuationAlthough orgasm and seminal fluid ejection often occur contemporaneously, the two processes are regulated by separate mechanisms. Ejaculation refers to the ejection of seminal fluid containing sperm and the secretions from seminal vesicles, prostate, and bulbourethral glands; it is regulated primarily by central nervous system activation of the sympathetic nervous system (we’ll look at this later, since it is really complex).

  1. Emission, the deposition of seminal fluid into the posterior urethra, depends upon the integrity of the vasa deferentia, seminal vesicles, prostate gland, and bladder neck.
  2. This emission is ejected out of the posterior urethra by the contractions of the bulbocavernosus and levator ani muscles. The entry of seminal fluid into the bladder is prevented by closure of the bladder sphincter (found in the bladder neck) due to sympathetic activation.
  3. The evacuation of the semen out of the body through the rhythmic contractions of these pelvic floor muscles is referred to as the physical component of the orgasm.
2 years ago
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