Do I need protection for oral sex?

Several STIs, including herpes, gonorrhea and syphilis, can pass through oral sex. Using a condom on a penis or a dental dam on a vulva or anus lowers that risk. If you don't have a dental dam, a condom cut lengthwise can work as one. Avoid brushing or flossing right before oral sex, since tiny cuts in your mouth may raise the risk.