The reality is you may never know if either you or your partner has an STI. Some STIs show no signs or symptoms, so the only way to know for sure is to be tested.

If you have questions about sexually transmitted infections or are wondering how you might prevent being exposed to STIs, you may want to visit our "How do I protect myself and others" section.

If you're in a new relationship, you could suggest that both you and your partner be tested before being sexually intimate.