Examples of high-risk sexual behavior include:

• Unprotected intercourse without male or female condom use, except in a long-term, single-partner (monogamous) relationship.
• Unprotected mouth-to-genital contact, except in a long-term monogamous relationship.
• Early sexual activity, especially before age 18.
• Having multiple sex partners.
• Having a high-risk partner (one who has multiple sex partners or other risk factors).
• Having anal sex or a partner who does, except in a long-term, single-partner (monogamous) relationship.
• Having sex with a partner who injects or has ever injected drugs.
• Exchange of sex (sex work) for drugs or money.