A vasectomy is a surgical procedure on a man that makes him sterile, or unable to get a woman pregnant. It is generally considered to be at least as effective as female sterilization and is simpler to perform, safer, and less costly.
Vasectomies are very effective. It has been estimated that only about 15 out of 10,000 couples get pregnant during the first year after a vasectomy. Although rare, pregnancy is possible even years after the procedure.