Many STIs have no symptoms, so getting tested is the only way to know for sure if you have an STI. This may involve a blood or urine test or a swab of the throat, vagina, rectum or urethra (pee hole). The type of testing depends on the type of STI. We often think that STIs only infect the genitals, but some can also infect the anus and the throat. It’s important to talk to your healthcare provider about the kinds of sex you’re having so all the right spots can be tested. How often you should be tested depends on how often you’re having sex and the kinds of sex you’re having. Talk to your healthcare provider about when to test.