Within a second or two later the ischiocavernosus and the bulbocavernosus muscles of the perineal region contract clonically initially at about one per 0.8 s squeezing the urethra and forcing out the ejaculate. As ejaculation proceeds, the interval between each striated muscle contraction gets longer and their force weaker until they gradually die out.(39) Their number can vary between 5 and 60. Most of the ejaculate is expressed in the first half dozen contractions. If the striated muscles are paralysed the semen is squeezed out only by the smooth muscle peristaltic contractions which produce a dribbling ejaculate with no projectile force and little pleasurable quality.

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