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Sexually transmitted infections

A worried looking teenage girl holding a pill packet
A sexually transmitted infection (STI) is an infection that you catch whilst you have sex. These include chlamydia, gonorrhoea, herpes, warts, HIV, and lice. With some of these you do not actually have to have full intercourse with someone to catch them. Some can happen through touching and fingering each other's bodies. There are also some infections which can be caught during sex but can also be caught in other ways - like 'thrush' (candida). For more info go to or