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 emitted from the penis. 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 ('pre' or 'precum'). 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, manual, 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, and ejaculation does not require erection.

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