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Testosterone is a hormone produced primarily in the testicles. Testosterone helps maintain men's: Bone density; Fat distribution; Muscle strength and mass; Facial and body hair; Red blood cell production; Sex drive; Sperm production
Â­From the outside, the male has two visible sex organs, the testes (or testicles) and penis. The testes are the primary male sexual organs in that they make sperm and produce testosterone. The sperm is the male sex cell, or gamete, and each testicle produces more than 4 million new sperm per hour [source: Angier ]. Testosterone is the hormone that causes male secondary sex characteristics such as facial and pubic hair, thickened vocal cords and developed muscles. The testes are housed outside of the main part of the male's body, in a sac called the scrotum. This location is important because in order for the sperm to develop properly, they must be kept at a temperature about two degrees cooler than normal body temperature.