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The muscle contractions of the orgasm can continue after ejaculation with no additional semen discharge occurring. The US study involving "29, US men aged 46 to 81 years" [34] suggest that "high ejaculation frequency was related to decreased risk of total prostate cancer". David; Boitani, Luigi 1 October To map the neuronal activation of the brain during the ejaculatory response, researchers have studied the expression of c-Fos , a proto-oncogene expressed in neurons in response to stimulation by hormones and neurotransmitters. Andrology Allergy Endocrinology Psychiatry. Harvard Medical School Prostate Knowledge. In three-quarters of men tested, ejaculate "is propelled with so little force that the liquid is not carried more than a minute distance beyond the tip of the penis.

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Two large studies: [31] [32] [33] "Ejaculation Frequency and Subsequent Risk of Prostate Cancer" [34] and "Sexual Factors and Prostate Cancer" [35] suggest that frequent ejaculation over a lifetime offers some protection against prostate cancer. University of Chicago Press. The duration of the refractory period varies considerably, even for a given individual. The rate of contractions gradually slows during the orgasm. Sexual addiction Sex Addicts Anonymous Sexual surrogate. The typical orgasm consists of 10 to 15 contractions, although the man is unlikely to be consciously aware of that many. In horses, sheep, and cattle, ejaculation occurs within a few seconds, but in boars , it can last for five to thirty [44] minutes.

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