Are you worried about something, or have you had unsafe sex? Then the best thing to do is to have an STI check-up.
Under 25? Check at a GGD health centre/Sense STI clinic if you can get a free STI test. A professional will test you confidentially for chlamydia and gonorrhoea. If necessary, you’ll be tested for other STIs, too.
Do you have casual sex? Make sure you are tested for STIs and HIV at least every 6 months. Are you a man who has sex with men? Get a free vaccination against hepatitis B.