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When you ejaculate the muscles of the epididymis and vas deferens contract and propel the sperm into the ejaculatory duct. Here the sperm mixed with secretions of the seminal vesicles and the prostate gland making up most of the seminal fluid) to form the semen. Powerful muscles surrounding the base of the urethra then cause the semen to squirt out of the penis at the time of orgasm.

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16y ago

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