A small sample study of seven men showed an average of 7 spurts of semen followed by an average of 10 more contractions with no semen expelled. One of the possible underlying causes of low volume or complete lack of semen is ejaculatory duct obstruction. At this stage, ejaculation cannot be stopped. Semen quality 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. The semen produced during early puberty is also typically clear.
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