Almost all sexual transmission of HIV occurs by unprotected vaginal or anal sex. Transmission of HIV by oral sex is very rare. A few cases of HIV transmission probably have occurred from an uninfected person performing fellatio (oral-penile sex) on an HIV-infected partner, but transmission from an infected oral partner to an uninfected penile partner, or by cunnilingus (oral contact with female genitals) is even more rare, if it occurs at all. Condoms or other barriers are considered optional for HIV prevention, and should be considered by persons who want to assure maximum protection.
(Read more about the risk of HIV from oral sex).
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