The risk of HIV transmission through oral sex is much less than that from anal or vaginal sex—but it is not zero.
It is difficult to measure the exact risk because people who practice oral sex may also practice other forms of sex during the same encounter. When transmission occurs, it may be the result of oral sex or other, riskier sexual activities, such as anal or vaginal sex.
If the person receiving oral sex has HIV, their blood, semen, pre-seminal fluid, or vaginal fluid may contain the virus. If the person performing oral sex has HIV, blood from their mouth may enter the body of the person receiving oral sex through the lining of the urethra (the opening at the tip of the penis), vagina, cervix, or anus, or through cuts and sores.
Several factors may increase the risk of HIV transmission through oral sex, including oral ulcers, bleeding gums, genital sores, and the presence of other sexually transmitted diseases (STDs).
Once semen gets past the mouth, stomach acid and enzymes in the esophagus kill the virus. So swallowing or spitting out semen (cum or precum) reduces your risk for HIV, compared with letting it sit in your mouth.
To reduce your risk of contacting any disease through Oral sex, it is best that you make sure you keep the mucous membranes in your mouth healthy – don’t perform oral for about 45 minutes after you brush your teeth, floss, or engage in any other aggravating oral behaviour.
NOTE: Do not engage in oral sex at all when you have open sores.
source: everydayng
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