Sperm duct - Transports the sperm cells from the testes into the urethra., Scrotum - Protects the testes and keeps them at the right temperature to make sperm cells. , Testes - Produce millions of male sex cells called sperm and makes male sex hormones, which affect the way a man's body develops., Penis - Passes urine out of the man's body and passes semen into the vagina of a woman during sexual intercourse., Urethra - The tube inside the penis that carries urine or semen. A ring of muscle makes sure that there is no chance of urine and semen getting mixed up.,

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