emission phase:

Or: emission , the first stage of the ejaculation process during which rhythmic muscular contractions (also known as myotonic contractions) in the vas deferens, prostate gland and seminal vesicles force the sperm and prostate and seminal-fluids into the ejaculatory ducts, thus forming semen .
Synonyms: first-stage-of-ejaculation ; first-stage orgasm .

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