The reality is you may never know if either you or your partner has an STD. Some STDs show no signs or symptoms, so the only way to know for sure is to be tested. The only way to be certain that your partner has an STD is if they've been tested and are honest with you about the test results.

If you are concerned and are not sure you can trust your partner, you may want to visit our "How do I protect myself and others" section for information on how you can stay safe.

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