Nothing is 100% but abstinence, but a vasectomy is highly effective. They are 99 to 99.5% effective at preventing pregnancy. Once a vasectomy is performed, it takes a few weeks to take effect; the patient must masturbate or have sex several times into a condom to rid the body of sperm, so until this period is over, and the sperm count has been verified, you must have protected sex in order to prevent pregnancy. But once this has been done, it is very effective. It is 99.5% effective, which is the best out there. Over 80% of pregnancies reported after the danger period post-vas is over are not genetically related to the man who has had the vasectomy.
Birth control and human sterilization
If the man has a vasectomy, his body should stop producing sperm. Unless the operation wasn't successful, there should be a zero percent chance of him causing pregnancy.
Tubal ligation, Essure, or hysterectomy for women and Vasectomy for men are permanent methods of birth control.
Norman Fleishman has written: 'Vasectomy, sex, and parenthood' -- subject(s): Birth control, Vasectomy
A vasectomy severs the vas deferens, preventing sperm from entering the man's ejaculate. This is a form of sterilization and birth control for males.
Because if there is no sperm in the ejaculate there is no fertilization.
Some different forms of birth control includes birth control pills, morning-after pills, condoms, diaphragms, vasectomy for men, and sterilization for women.
Perhaps you mean vasectomy, a form of male birth control, where the vas deferens is severed.
Condoms and vasectomy (sterilization) is all that is currently available - researchers have been working on male birth control for decades, but at this time none have been approved.