It cuts the ducts that would otherwise have lead semen from the testicles out though the penis. No semen, no pregnancies.
It doesn't affect ejaculation though, it's mainly made up of "supporting" fluids. It'll look the same even with the semen removed.
JUST DONT HAVE IT!! duhhh Get on birth control, use a condom, don't have sex, have a vasectomy or get your tubes tied. Ask your doctor for the method that is best for you.
The vasectomy should make him completely infertile; no pregnancy will result.
A Vasectomy!
no it can't prevent pregnancy
Vitamins don't prevent pregnancy.
BV won't prevent pregnancy.
Starch as in pasta, potatoes etc? That does not prevent pregnancy.
NO ! ONLY contraception or abstinence can prevent pregnancy !
No. Cytotec can be used for abortion but not to prevent pregnancy.
Yaz is a birth control pill. It is intended to prevent pregnancy.
Vastectomies can be reversed, but it isn't 100% effective.
Advil don't prevent pregnancy no matter how many you take.