Sperm passes from the testes to the penis in tubes called the vas deferens. A vasectomy is a surgery that blocks these tubes. This makes a man unable to make a woman pregnant.

Male Reproductive Anatomy
male reproductive organs
Copyright © Nucleus Medical Media, Inc.

The surgery is done to make you sterile. This means that you are unable to cause a pregnancy.

A vasectomy is done as permanent birth control. This option is for men who are sure they will not want to father a child in the future. There is a surgery to reverse a vasectomy. However, the reverse is not always successful.