Clinical services Health Information Sexual Health Check Sexual health check A sexual health check is a check-up by a doctor, nurse or other health worker. People do not need to be experiencing symptoms to have a check-up as there are a number of STIs which often cause no symptoms but can have significant effects on your health (e.g. chlamydia). A sexual health check is advisable if you: think you have an STI have had unprotected sex with casual partners are starting a new sexual relationship have different partners have been sexually assaulted want to discuss safe sex or contraception