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Semen is made up of sperm (male cells for sexual reproduction) floating in a fluid called seminal plasma. Sperm, also called spermatozoa, are made by a man's testicles and mature (grow up) in the epididymis. The fluids in seminal plasma come from different glands in the man's body: the seminal vesicles, prostate and bulbourethral glands (also called the Cowper's glands).
The male reproductive system includes the testicles, which produce testosterone and sperm. It takes roughly 72 days for sperm to be created, and sperm are stored in the epididymis (the outer structure of the testicles) for anywhere from 15 to 25 days. Here, the sperm mature and develop the ability to swim.