The risk is lower than during vaginal or anal sex but it is possible to contract HIV through oral sex. Blood, semen, pre-seminal fluid, and vaginal fluid all may contain the virus. Cells in the mucous lining of the mouth may carry HIV into the lymph nodes or the bloodstream. The risk increases if you have cuts or sores around or in your mouth or throat; if your partner ejaculates in your mouth; or if your partner has another sexually transmitted disease. When performing oral sex on a male, always use a condom unless in a monogamus relationship where both partners have been tested. When performing oral sex on a woman, the same applies but with a latex barrier. There are no such things as tongue condoms and if there were they wouldn't do much to protect against STD's, please don't put a condom on your tongue. For performing oral sex on a woman, a dental dam, a latex condom cut into a square ( cut off the tip then cup down the side ), or even plastic food wrap can be used as a barrier.
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Oral sex 
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