This first semen volume is small. Most first ejaculations 90 percent lack sperm. This group were one-third less likely to develop aggressive prostate cancer when compared with men who ejaculated less than three times a week at this age. The muscle contractions of the orgasm can continue after ejaculation with no additional semen discharge occurring. Alternating between the two sides allows for persistent stimulation to induce ejaculation without impeding the refractory period. University of Chicago Press. Ejaculation may also occur spontaneously during sleep a nocturnal emission or "wet dream".
Kenna. Age: 24.
As the male proceeds through puberty, the semen develops mature characteristics with increasing quantities of normal sperm.
Taliyah. Age: 32.
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Journal of Sexual Medicine. In other projects Wikimedia Commons. A short recovery period may allow partners to continue sexual play relatively uninterrupted by ejaculation. A Comparative Overview of Mammalian Fertilization.