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Answer:
The testes, also known as testicles or male gonads, lie behind the penis in a pouch of skin called the scrotum. The testes move freely in the scrotum but each testis is attached to the body wall by a thin cord called the spermatic cord, which passes through a cavity in the pelvis and into the abdomen. The cord contains the nerves and blood vessels for the testes as well as the vas deferens, which carries the sperm from the testes into the urethra; the urethra is the passageway for sperm to the outside of the body at ejaculation.
The testes lie outside of the body and are maintained at a temperature about two degrees Centigrade lower than the body's core temperature. This is because sperm production and quality is optimal at this lower temperature.