The testicles (also called testes or
gonads) are the male sex glands. They are located behind the penis in
a pouch of skin called the scrotum. The testicles produce and store
sperm, and they are also the body's main source of male hormones
(testosterone). These hormones control the development of the
reproductive organs and other male characteristics, such as body and
facial hair, low voice, and wide shoulders.
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