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Roger Pebody
Published: 16 September 2015

Condoms are used during sex to provide a barrier. When used properly and consistently, they can prevent HIV and many other sexually transmitted infections. Used correctly, they are also an effective form of contraception (preventing a pregnancy). Both male and female condoms are available.

If you’re having difficulties with condoms, such as breakages, or irritation in the genital area, or perhaps you’re finding it difficult to negotiate using condoms with your partner, you can speak to a trained health adviser in your HIV or sexual health clinic.

Using male condoms correctly

Male condoms come in a range of shapes, sizes, thicknesses, flavours, textures and colours. Though the standard size will fit most men, smaller and larger condoms are available. Use a brand that fits well. Some condoms are only designed to enhance sexual pleasure and do not act as an effective, protective barrier. Check the information on the package. Normal-strength condoms can be safely used for anal sex.

Condoms come rolled up in a plastic or foil wrapper. When opening the wrapper be careful not to tear the condom.

  • Put the condom on once the penis is hard, but before sexual contact begins. Unroll the condom all the way down the shaft of the penis.
  • Condoms come with a teat or a plain end. In either case, it is important to allow enough room for the semen to be able to fill the end of the condom. Make sure there is no air in the condom, by holding the teat or end between your thumb and forefinger as you roll the condom on. If you leave air in the end of the condom, it may break when you ejaculate into it.
  • If the penis goes soft, the condom may slip. This is the biggest single cause of condom failure. Holding the base of the condom will help it stay in place. If the condom slips or breaks, withdraw immediately and use a new one.
  • After ejaculating, withdraw the penis promptly, before it goes soft. Hold on to the base of the condom as you withdraw.
  • Never re-use condoms. Don’t use two condoms at once, as the friction between them may cause them to split.
  • If you are having penetrative sex for a long time, the risk of the condom breaking increases. It is safest to change the condom every 30 minutes.

When these guidelines are not followed, condoms are more likely to break or come off.

Choosing a lubricant

Lubricants can be used to assist penetration in vaginal and anal sex. The vagina usually lubricates itself when a woman is sexually aroused; you may not need additional lubricant for vaginal sex unless the vagina feels dry.

You should always use lubricant for anal sex. Most condoms come pre-lubricated, but this is not adequate for anal sex and may not be for vaginal sex. 

Apply lubricant to the outside of the condom (once it is on the penis) and to the entrance to the rectum or vagina. Don’t put lubricant inside the condom as this can cause it to slip off during sex.

Latex condoms should be used with a water-based, or preferably silicone-based lubricant. Never use oil-based lubricants such as body lotions, massage oils, or Vaseline, as these weaken the latex and can cause the condom to break.

Using female condoms correctly

The female condom (sometimes referred to by the brand name Femidom) is a thin plastic pouch (made of polyurethane) with a flexible ring at each end. Instead of being put on to the penis, it is put inside the vagina. It comes pre-lubricated, but you may want to use additional lubricant; you can use any sort as the female condom is not made of latex.

You can put a female condom in several hours before sex if you want to.

  • Find a comfortable position. You can stand with one foot on a chair, sit on the edge of a chair or bath, lie down, or squat.
  • Squeeze together the sides of the inner ring at the closed end of the female condom and insert it into the vagina like a tampon.
  • Putting a finger inside the female condom, push the inner ring into the vagina as far as you can.
  • Pull out your finger and let the outer ring stay outside the vagina.
  • When you are ready to have sex, use your hand to guide your partner’s penis in, making sure his penis doesn’t slip between the condom and the side of the vagina.
  • The female condom is loose-fitting and will move during sex. That’s fine as long as the penis stays inside it.
  • You don’t have to take it out immediately after sex. When you do remove it, squeeze and twist the outer ring to keep semen inside the pouch. Gently pull it out of the vagina.


Some condoms are coated with a spermicide to assist contraception. However, the spermicide nonoxynol-9 can cause irritation, genital sores or lesions in the rectum or vagina and increase the chance of passing on an infection, including HIV. Try to avoid condoms with a spermicide, and don’t use additional spermicide as a lubricant.

How effective are condoms?

In laboratory tests, under conditions of perfect use, male condoms are up to 99.5% effective.

However, people who plan to use condoms may not in fact do so every time they have sex. Also, people sometimes use condoms in the wrong way – for example, using a condom that is not the right size for the penis. This increases the risk of condoms slipping off or breaking.

For these reasons, the ‘real world’ effectiveness of condoms is somewhat lower. Studies show that heterosexual couples who say they have used condoms every time they have sex have around 80% fewer cases of HIV infection than couples who say they have not used condoms at all. Similarly, gay couples who say they consistently use condoms have around 70% fewer cases of HIV than couples who haven’t used them.

This is a difficult topic to research and these are rough estimates: the true figures could be somewhat higher or lower. Also, these are averages across a wide range of people. For an individual who can use a condom every single time he or she has sex and who uses them in the right way, condoms will be more effective than this. But it may be unrealistic to expect a single prevention method to provide 100% protection or to work every single time.

Research shows that female condoms have a similar level of effectiveness as male condoms when used by heterosexual couples.

Choosing and getting condoms

It's important to choose good quality condoms. Check for a quality mark such as the BSI Kitemark or the European CE mark, and check the expiry date. Don’t use condoms that have been exposed to light or direct heat for any length of time.

Male condoms are commonly sold in shops, but female condoms aren’t as widely available. If you buy condoms on the internet, make sure you buy them from a reliable retailer, such as this NHS website: HIV, sexual health and contraception clinics provide free condoms.

Contact NAM to find out more about the scientific research and information used to produce this factsheet.

This content was checked for accuracy at the time it was written. It may have been superseded by more recent developments. NAM recommends checking whether this is the most current information when making decisions that may affect your health.