Are there any recent studies to clarify the level of risk and also which reports would you regard as the most accurate? HIV does not discriminate based on age, sex, ethnicity, sexual orientation, or occupation. This could be done by removing the mouth from the penis before ejaculation, or by using a condom. The risk for acquiring HIV is based not on the person, but on the risky activity involved for example needle sharing or unprotected anal or vaginal sex. However, it is hard to know the exact risk because a lot of people who have oral sex also have anal or vaginal sex. Latex barriers and medicines to prevent and treat HIV can further reduce the very low risk of getting HIV from oral sex. Thanks for your help. When a person living with HIV is taking effective HIV treatment, their viral load should decline until it is so low that it cannot be detected by the tests. This, together with the evidence that undetectable viral load prevents transmission has dramatically changed more discussions about HIV risk. When is oral sex more risky? The risk of HIV being passed on during oral sex centres on fluid containing HIV semen, vaginal fluid or blood finding a way into the bloodstream of an HIV-negative person via the mouth or throat, which is more likely if there is inflammation, or cuts or sores present. Viral load is the term used to describe the amount of HIV in a sample of body fluid. HIV is not easily transmitted by oral sex — and it probably needs all the factors you listed. Therefore, you should not have to repeat the HIV test for the oral sex you got 4 weeks ago. A number of studies have tried to figure out the exact level of risk of oral sex, but it can be difficult to get accurate information. They are likely to be highest around the time of menstruation having your period , when HIV-bearing cells shed from the cervix are most likely to be found in vaginal fluid, along with blood.