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Chlamydia is the most commonly diagnosed sexually transmitted infection (STI) among under-25s. Often there are no symptoms, but testing and treatment are simple.
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Where to get advice on sex and relationships, including contraception, STIs and counselling.
Advice on how to talk to a new partner about safer sex and your sexual history.
The risks of getting sexually transmitted infections (STIs) through various sex activities, including oral and anal sex.
What to expect at an STI clinic, including tests, treatment and the questions you may be asked.
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Find out the symptoms that could mean you have a sexually transmitted infection (STI).
A sexual health expert answers questions on infections, discharge, itching, smells and anal sex.
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Find out about keeping your vagina clean and healthy, without using a douche, scented wipes or perfume.
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Sexual health information and support
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You decide what happens in this interactive video about sexual health.
Answers to sex FAQs, including saying no, what to do if a condom splits, being gay and more
Where to get sexual health help urgently, including advice following unprotected sex and sexual assault
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