The main way to prevent HIV infection is to avoid activities that put you at risk, such as sharing needles and having unprotected sex.
If you have HIV you can pass it on to others if you have sex without a condom, engage in any other sexual behaviour without protection, or share infected needles.
It is important to continue to practise safer sex even if you and your sexual partner both have HIV. This is because you can catch another strain of the virus that your HIV medication may not be able to control.
Knowingly infecting somebody with HIV is a criminal offence in the UK. People have been found guilty of passing on HIV and sent to prison.
Sex
HIV can be spread by having unprotected sex, including vaginal, oral and anal sex. It can also be caught from sharing sex toys with someone infected with HIV.
The best way to prevent HIV and other sexually transmitted infections (STIs) is to use a condom for penetrative sex and a dental dam for oral sex.
Condoms
Condoms come in a variety of shapes, colours, textures, materials and flavours. Both male and female condoms are available.
A condom is the most effective form of protection against HIV and other STIs. They can be used for vaginal and anal sex, and oral sex performed on men and women.
HIV can be passed on before ejaculation, through pre-come and vaginal secretions, and from the anus.
It is very important that condoms are put on before any sexual contact occurs between the penis, vagina, mouth or anus.
Lubricant
Lubricant, or lube, is often used to enhance sexual pleasure and safety, by adding moisture to either the vagina or anus during sex.
Lubricant can make sex safer by reducing the risk of vaginal or anal tears caused by dryness or friction, and it can also prevent a condom from tearing.
Only water-based lubricant (such as K-Y Jelly) rather than an oil-based lubricant (such as Vaseline or massage and baby oil) should be used with condoms.
Oil-based lubricants weaken the latex in condoms and can cause them to break or tear.
Dental dams
A dental dam is a small sheet of latex that works as a barrier between the mouth and the vagina or anus to reduce the risk of STIs during oral sex.
Dental dams are available in a variety of flavours and colours, and typically come in two forms:
- a sheet, which can be spread across the vagina or anus and held in place during oral sex by either the giver or the receiver
- a mask with elasticised bands, which is held in place around the ears of the person giving oral sex, leaving the hands free
It is important that dams are only used once, the same side of the dam is always kept against the body, and a new dam is used if a new area of the body is being stimulated. A dam should never be moved from the vagina to the anus or vice versa.
Find out more about what sexual activities can put you at risk of HIV and other STIs.
Sharing needles
If you inject drugs, don't share needles as this could expose you to HIV and other viruses found in the blood, such as hepatitis C.
Many local authorities and pharmacies offer needle exchange programmes, where used needles can be exchanged for clean ones.
If you are a heroin user, consider enrolling in a methadone programme. Methadone can be taken as a liquid, so it reduces your risk of getting HIV.
A GP or drug counsellor should be able to advise you about both needle exchange programmes and methadone programmes.
