From Wikipedia, the free encyclopedia. The muscle contractions of the orgasm can continue after ejaculation with no additional semen discharge occurring. 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. Two large studies:    "Ejaculation Frequency and Subsequent Risk of Prostate Cancer"  and "Sexual Factors and Prostate Cancer"  suggest that frequent ejaculation over a lifetime offers some protection against prostate cancer. Most men experience a refractory period immediately following an orgasm, during which time they are unable to achieve another erection, and a longer period again before they are capable of achieving another ejaculation. Archived from the original on 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.
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A short recovery period may allow partners to continue sexual play relatively uninterrupted by ejaculation. In horses, sheep, and cattle, ejaculation occurs within a few seconds, but in boars , it can last for five to thirty  minutes. It is the final stage and natural objective of male sexual stimulation , and an essential component of natural conception. Harvard Medical School Prostate Knowledge. Hypothalamic—pituitary—gonadal axis Hypothalamic—pituitary—prolactin axis Andrology Hormone. The number of sperm in an ejaculation also varies widely, depending on many factors, including the time since the last ejaculation,  age, stress levels,  and testosterone.