Thank you for your inquiry. From what we gather from the question, you were asking about the risk of HIV transmission from receiving oral sex without a condom. From the information given, this scenario is determined to be Negligible Risk (there is no evidence or no documented cases of transmission. However, there is a theoretical possibility of transmission under certain extenuating circumstances).
In order for HIV to be transmitted, fluids containing HIV such as blood must gain direct access to the bloodstream. HIV is not transmitted by saliva, unless it is mixed with a large amount of an HIV positive fluid such as blood (1). One study has shown that the hypotonicity of saliva actually lyses leukocytes and thereby interrupts virus multiplication, meaning that saliva does not allow for HIV survival (2). In order for HIV to be transmitted a HIV positive fluid must have direct access to your bloodstream through an activity with little exposure to oxygen. The scenario mentioned above could meet the three components of the transmission equation under the circumstances that the individual had a large amount of blood present in her mouth while she was performing oral sex without a barrier.
Its important to note that when multiple questions are asked, we do a risk assessment for the highest risk activity, which in this case is the unprotected oral sex.
Recommendation: There is no evidence or no documented cases of transmission. Refer to a healthcare professional for more personalized answers.
AIDS Vancouver Helpline/Online, Rashell
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1.) HIV Transmission Basics
2.) HIV Transmission by Oral Secretions