Penile-Oral Sex
Of the different sex acts, the one that often causes the greatest amount of confusion in terms of risk – and raises the greatest number of questions – is penile-oral sex. The fact is, most experts agree that fellatio, sometimes referred to as "blow jobs," is not an efficient route of HIV transmission. However, this does not mean that it cannot happen.
Research attempting to evaluate the risk of fellatio has often faced important limitations. For starters, very few people participating in studies only engaged in penile-oral sex. Many people also had unprotected vaginal or anal intercourse, making it very difficult to determine if unprotected fellatio is an "independent factor" associated with HIV transmission. There are also people who test positive for HIV and claim that unprotected fellatio was their only risky behavior. However, it's virtually impossible to know if these people are always reporting their sexual behavior accurately. (Study volunteers often have a difficult time admitting the truth about potentially embarrassing behavior to healthcare professionals conducting scientific studies.)
Because unprotected fellatio can mean that body fluids from one person can (and do) come into contact with the mucosal tissues or open cuts, sores, or breaks in the skin of another person, there is a "theoretical risk" of HIV transmission. "Theoretical risk" means that passing an infection from one person to another is considered possible, even though there haven't been any (or only a few) documented cases. This term can be used to differentiate from documented risks. Having unprotected receptive anal or vaginal intercourse with an HIV-positive partner is a documented risk, as they have been shown in numerous studies to be an independent risk factor for HIV infection. Having unprotected oral sex is a theoretical risk, as it is considered possible, but has never been shown to be an independent risk factor for HIV infection.
Here's a good way to think about theoretical risk: In theory, it is possible that while walking down the street, a meteor will fall on your head and kill you instantly. This is because meteors do occasionally fall to earth. People live their lives above ground, so there is a theoretical risk of being hit be a meteor. In fact, there have been reports of a few people being hit by meteors. But because the risk is so small, given that few meteors fall to earth and the large number of inhabitants of this planet, the risk is purely theoretical. The same principle holds true with oral sex – millions of people all over the world are believed to engage in unprotected oral sex and there have only been a handful of documented cases of HIV transmission. In turn, fellatio, and other types of oral sex (see below), remains a theoretical risk for HIV infection.
There have been a number of studies that have closely followed MSM and heterosexual couples, in which one partner was HIV positive and the other partner was HIV negative. In all of the studies, couples that used condoms consistently and correctly during every experience of vaginal or anal sex – but didn't use condoms during oral sex – did not see HIV spread from the HIV positive partner to the HIV negative partner.
There have been three case reports and a few studies suggesting that some people have been infected with HIV as a result of unprotected oral sex. However, these case reports and studies all involved MSM – men who were the receptive partners (the person doing the "sucking") during unprotected oral sex with another HIV-positive man. There haven't been any case reports or studies documenting HIV infection among female receptive partners during unprotected oral sex. Even more importantly, there hasn't been a single documented case of HIV transmission to an insertive partner (the person being "sucked") during unprotected oral sex, either among MSM or heterosexuals.
Is insertive oral sex a possible route of HIV transmission? Yes. But is it a documented risk? Absolutely not
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