The production of sperm is a process that occurs in the epididymis (also called the testes). The number of sperm produced depends on a number of different factors, such as genes, environment, physical condition or the frequency of sexual intercourse, and can thus be different for each man. Sperm are constantly being produced in the seminiferous tubules.
At any time, the average mature man has about two to three billion sperm available, at different stages of maturity. The average sperm maturation process takes about two to three months, i.e. every 3 months a “new set” of sperm is formed. Hormones play a decisive role in sperm production (spermatogenesis). The pituitary gland (hypophysis) produces a hormone that is known as follicle-stimulating hormone (FSH). At the same time, the luteinising hormone (LH) is produced. In women both hormones lead to the maturation of eggs, while they stimulate sperm production in men.