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Īlfred Kinsey measured the distance of ejaculation, in "some hundreds" of men. This study also found a high correlation between number of spurts of semen and total ejaculate volume, i.e., larger semen volumes resulted from additional pulses of semen rather than larger individual spurts. A small sample study of seven men showed an average of 7 spurts of semen followed by an average of 10 more contractions with no semen expelled.
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The muscle contractions of the orgasm can continue after ejaculation with no additional semen discharge occurring. After this peak, the magnitude of semen the penis emits diminishes as the contractions begin to lessen in intensity. For most men, the first ejection of semen occurs during the second contraction, while the second is typically the largest expelling 40% or more of total semen discharge. Įjaculation usually begins during the first or second contraction of orgasm. Many men also experience additional irregular contractions at the conclusion of the orgasm. Contractions of most men proceed at regular rhythmic intervals for the duration of the orgasm. Initial contractions occur at an average interval of 0.6 seconds with an increasing increment of 0.1 seconds per contraction. The rate of contractions gradually slows during the orgasm. At this stage, ejaculation cannot be stopped. Once the first contraction has taken place, ejaculation will continue to completion as an involuntary process.
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The typical orgasm consists of 10 to 15 contractions, although the man is unlikely to be consciously aware of that many. The typical male orgasm lasts several seconds.Īfter the start of orgasm, pulses of semen begin to flow from the urethra, reach a peak discharge and then diminish in flow. They are generated by the bulbospongiosus and pubococcygeus muscles under the control of a spinal reflex at the level of the spinal nerves S2–4 via the pudendal nerve. These rhythmic contractions are part of the male orgasm. The semen is ejected through the urethra with rhythmic contractions. At that point, under the control of the sympathetic nervous system, semen containing sperm is produced (emission). When a man has achieved a sufficient stimulation and orgasm, ejaculation begins. An orgasm that is not accompanied by ejaculation is known as a dry orgasm. If a man is unable to ejaculate in a timely manner after prolonged sexual stimulation, in spite of his desire to do so, it is called delayed ejaculation or anorgasmia. Premature ejaculation is when ejaculation occurs before the desired time. In addition, infectious agents (including HIV) can often be present in pre-ejaculate. While the presence of sperm in pre-ejaculatory fluid is thought to be rare, sperm from an earlier ejaculation, still present in the urethra, may be picked up by pre-ejaculatory fluid. A prolonged stimulation either through foreplay (kissing, petting and direct stimulation of erogenous zones before penetration during intercourse) or stroking (during masturbation) leads to an adequate amount of arousal and production of pre-ejaculatory fluid. With regard to intravaginal ejaculation latency time, men typically reach orgasm 5–7 minutes after the start of penile-vaginal intercourse, taking into account their desires and those of their partners, but 10 minutes is also a common intravaginal ejaculation latency time. Penile sexual stimulation during masturbation or vaginal, anal, oral, or non-penetrative sexual activity may provide the necessary stimulus for a man to achieve orgasm and ejaculation. See also: Sexual stimulation, Orgasm § In males, Intravaginal ejaculation latency time, and Sexual arousal § Male physiological responseĪ usual precursor to ejaculation is the sexual arousal of the male, leading to the erection of the penis, though not every arousal nor erection leads to ejaculation.