What can you do to prevent an STI?

There are several ways to reduce your risk of STIs.

• Abstain from sex. This is the most effective way to avoid STIs.
• Stay with an uninfected partner. Have sex only with a long-term monogamous partner who isn't infected.
• Wait and verify. Avoid vaginal and anal intercourse with new partners until you have both been tested for STIs. Oral sex is less risky, but use a latex condom or dental dam — a thin, square piece of rubber made with latex or silicone — to prevent direct contact between the oral and genital mucous membranes.
• Use condoms and dental dams consistently and correctly. Use a new latex condom or dental dam for each sex act, whether oral, vaginal or anal. Never use an oil-based lubricant, such as petroleum jelly, with a latex condom or dental dam. Condoms made from natural membranes are not recommended because they're not as effective at preventing STIs.