A vasectomy is a minor surgical procedure that is done to make a man sterile (unable to father children). The procedure is usually done by a urologist, a specialist who deals with the male reproductive system. A vasectomy cuts or blocks the vas deferens, the tube that carries sperm away from the testicle to be added to semen. There are two vas deferens, one for each testicle on each side. Once the vas deferens are cut or blocked, sperm cannot pass from the place where there are manufactured, the testicle, to the reservoir where semen and prostatic secretions (secretions from the prostate gland) are stored. It is the combination of sperm and the secretions from the prostate that allow sperm to survive. During ejaculation, this sperm containing fluid is ejected through the ejaculatory duct and through the penis during orgasm. After a vasectomy, a man can continue to have normal erections, normal sexual intercourse and normal ejaculations of semen, but this ejaculate is sperm-free and cannot impregnate a female sexual partner.
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