A vasectomy is a minor outpatient surgical procedure for male sterilization as a permanent method of birth control.

It is the most commonly performed urologic procedure in the United States, with an estimated 500,000 or more sterilizations performed annually. Vasectomy is the most effective form of any birth control available, with a 99.95% success rate in preventing pregnancy.

Vasectomy should only be considered by men who are 100% sure that no future children are desired. A vasectomy works by permanently blocking the exit flow of sperm from the testicle.

Because the ejaculate is primarily composed of fluid (semen), there is no noticeable change in the ejaculate appearance or volume when a man ejaculates after vasectomy. The testicles continue to produce sperm, but the sperm is effectively reabsorbed by the body, and sexual function, including erections, sexual desire, sensitivity, and ejaculation, are unchanged.