However, given that condoms aren’t 100 percent effective, the CDC recommends taking additional precautionary steps.
Not as much is known about the potential risk of getting HIV through oral intercourse, Henderson says.
The CDC considers oral intercourse to be a low-risk behavior regarding HIV, though the presence of another STD may increase the risk of transmission.
The risk is also greater if the person performing oral sex has mouth sores, bleeding gums, or comes into contact orally with menstrual blood.
The riskiest form of this behavior is mouth-to-penis oral sex, especially if ejaculation occurs in the mouth, Henderson says.
Using a condom or a dental dam may help reduce the risk of HIV transmission in these situations.