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The male reproductive system or male genital system is responsible for ensuring reproduction in males. It is made up of internal and external organs. The main external organs are the testes, the epididymis, and the penis. The testicles are housed in the scrotum or scrotal sac, formed by a set of envelopes that cover and house them. The internal structures are the vas deferens and accessory glands that include the prostate and bulbourethral glands.