A vasectomy is a minimally invasive, outpatient surgery designed to prevent a man's sperm from leaving his body, thus providing him and his partner with a permanent form of birth control. The procedure is safe and low-risk and is frequently performed under local anesthesia in an office or clinic.
In a majority of cases, there is no need for general anesthesia or time in the operating room. The entire procedure usually takes from 10 to 30 minutes, according to Mayo Clinic. It involves the doctor severing and cauterizing the tubes that carry sperm from the man's testicles to mix with the rest of his seminal fluid when he ejaculates. It causes no changes in his sexual functioning, nor does it visibly change his ejaculate—it simply means no sperm are present in it.