Vasectomy is an effective and permanent form of contraception. The operation is quicker, easier and more effective than female sterilisation. There is a very small failure rate. Sterilisation is only for people who have decided they do not want children, or further children in the future. It is considered a permanent method of contraception, as reversal is a complicated operation which is not always successful. In addition, reversal is not usually available on the NHS.

Vasectomy is a small operation to cut the vas deferens. This is the tube that takes sperm from the testicles (testes) to the penis. Sperm are made in the testes. Once the vas deferens is cut, sperm can no longer get into the semen that comes out (is ejaculated) during sex.

Vasectomy is very reliable – but not quite 100%. Even after a successful operation about 1 in 2,000 men who have had a vasectomy will become fertile again at some point in the future. This is because, rarely, the two ends of the cut vas deferens re-unite over time. In a few cases, operations are not successful and tests show sperm are still present in semen after the operation. This occurs in less than 1 in 100 operations.

Vasectomy is usually done under a local anaesthetic. This means you are awake but have an injection into the skin so that you do not feel pain. Local anaesthetic is injected into a small area of skin on either side of the scrotum above the testicles (testes). A small cut is then made to these numbed areas of skin. Occasionally vasectomy is done under ageneral anaesthetic.

A tiny cut or puncture hole is made in the skin on each side of the scrotum. The vas deferens can be seen quite easily under the cut skin. It can be cut with a surgical knife (scalpel) or using diathermy. Diathermy is electrical current that cuts and seals the ends of the tubes. It stops bleeding at the same time. Sometimes a small piece of the vas deferens is removed.

The hole is so small you may not need any stitches. If you do, dissolvable stitches are used, or a special surgical tape. The operation takes about 15 minutes.

There is usually some discomfort and bruising for a few days afterwards. This normally goes away quickly. The discomfort can be helped by wearing tight-fitting underpants day and night for a week or so after the operation. It is also best not to do heavy lifting or strenuous exercise for four weeks or so after the operation.


Most men have no problems after a vasectomy. Problems are uncommon but include the following:

  • As with any operation or cut to the skin, there is a small risk of a wound infection.
  • The bruising around the operation site is sometimes quite marked. However, it will go in a week or so.
  • Rarely, sperm may leak into the scrotum and form a swelling which may need treatment.
  • A small number of men have a dull ache in the scrotum for a few weeks or months after the operation. This usually settles within three months.
  • A small number of men develop a pain which does not settle over time. This can be mild or severe. It may be in the scrotum, the penis, the testicles (testes) or the lower tummy.
  • If you have a general anaesthetic, as with any operation, there is a small risk associated with the anaesthetic.

Some sperm survive in the upstream part of the vas deferens for several weeks after vasectomy. These can get into the semen for a while after the operation. About twelve weeks after the operation you will need to produce a semen test. This is looked at under the microscope to check for sperm.  If there are no sperm in this sample, you will be given the all clear. If not, you will need another test a month later. You will be told when the test shows the operation has been successful. Until this time you should continue using another method of contraception.

It is permanent and you don’t have to think of contraception again. It is easier to do and more effective than female sterilisation.

It may take a few months before the semen is free from sperm. As it is permanent, some people regret having a vasectomy, especially if their circumstances change. Vasectomy does not protect you from sexually transmitted infections.

No. The sex hormones made by the testicles (testes) – for example, testosterone – continue to be passed into the bloodstream as before. Also, vasectomy does not reduce the amount of semen when you come (ejaculate) during sex. Sperm only contributes a tiny amount to semen. Semen is made in the seminal vesicles and prostate higher upstream.

Sex may even be more enjoyable, as the worry or inconvenience of other forms of contraception is removed.

Sperm are still made as before in the testicles (testes). The sperm cannot get past the blocked vas deferens and are absorbed by the body.

Do not consider having the operation unless you and your partner are sure you do not want children, or further children. Consider all sorts of situations including a tragedy in the family or a break-up of your relationship. Only have a vasectomy if you are sure you would not want more children even in those situations. It is wise not to make the decision at times of crisis or change, such as after a new baby or termination of pregnancy. It is best not to make the decision if there are any major problems in your relationship with your partner.

Remember there are reversible forms of long-term contraception which are very effective. Consider these as a couple before making your decision. Long-acting contraception choices include coils, implants and injections. These are all for women.

Doctors normally like to be sure that both partners are happy with the decision before doing a vasectomy. However, it is not a legal requirement to get your partner’s permission.