From the United States Federal Government's Centers for Disease Control and Prevention, http://www.cdc.gov/hiv/resources/qa/transmission.htm. Nov 28, 2011.
Yes, it is possible for either partner to become infected with HIV through performing or receiving oral sex, though it is a less common mode of transmission than other sexual behaviors (anal and vaginal sex). There have been a few cases of
HIV transmission from performing oral sex on a person infected with HIV.
While no one knows exactly what the degree of risk is, evidence suggests
that the risk is less than that of unprotected anal or vaginal sex.
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);
the lining of the vagina or cervix;
the lining of the anus; or
directly into the body through small cuts or open sores.
If the person receiving oral sex has HIV, their blood, semen (cum),
pre-seminal fluid (pre-cum), or vaginal fluid may contain the virus.
Cells lining the mouth of the person performing oral sex may allow HIV
to enter their body.
The risk of HIV transmission increases
if the person performing oral sex has cuts or sores around or in
their mouth or throat;
if the person receiving oral sex ejaculates in the mouth of the
person performing oral sex; or
if the person receiving oral sex has another sexually
transmitted disease (STD).
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