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The testicle is the male gonad in animals. The primary functions of the testes are to produce sperm (spermatogenesis) and to produce androgens, primarily testosterone. Male mammals, humans included, have two testicles, placed in the scrotum behind the penis. The testicles are placed outside the body, because the production of sperm functions better at lower temperatures than the body's 37 degrees. The production of sperm and testosterone is controlled by hormones, and once the sperm is produced, it is then transported to the epididymis, where it is maturing for around 14 days.