Male Sterilization, called vasectomy, is a form of "permanent" contraception. This involves surgical procedure in which the vas deferens is cut and the cut ends tied, preventing sperm from travelling from the testes to form part of the semen.

Erection and ejaculation is not affected.

The surgical procedure is usually done out patient, and takes 15 to 30 minutes; local anesthetic is used.

After the procedure, sperm may still be present for as long as 12 weeks. Tests need to be done on the semen to confirm there are no sperm cells in the semen, and the man is infertile.