Anyone who has sexual intercourse without using a barrier method of contraception is at risk of contracting €“ or transmitting €“ a sexually transmitted infection (STI). One of the most common STIs in the UK is chlamydia, which can cause burning when urinating, discharge from the vagina or penis, pain in the testicles, and abnormal vaginal bleeding.

However, many people don't experience any symptoms so are unaware they are carrying the infection. This can lead to serious problems such as infertility if left untreated.

Chlamydia tests are available from some pharmacies, sometimes on a free of charge basis. Most use a simple urine test, though some involve taking a swab, with results available around a week later. If a positive test result is obtained, antibiotic treatment is needed, and in some cases this can be purchased over the counter (example: Clamelle).

Other STIs, such as gonorrhea, genital warts, syphilis, genital herpes, trichomonas vaginalis, public lice and HIV need to be tested for €“ and treated if necessary €“ at a GP surgery or sexual health clinic. In all cases, anyone who tests positive for any STI should be encouraged to contact anyone they have had sexual relations with so they can also be tested.