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Semen from mouth on penis

Question: 

Hello,

I hope you can help me.
I recently hooked up with a guy I don't know in a cruising area. As far as I can tell, I was safe.
He gave me a blowjob and we used a condom. However, he normally practices unsafe sex I found out.
My question is - how high is the risk, if someone else had ejaculated in his mouth before he gave me a blowjob? I don't know, but there might have still been some sperm in his mouth?
I would be very grateful for a quick reply, many thanks!

Answer: 

Hello,

Thank you for your inquiry. From what we gather from the question, you were asking about the risk of acquiring HIV by receiving oral sex with a barrier. From the information given, this scenario is determined to be Negligible Risk there are no evidence or no documented cases of transmission. However, there is a theoretical possibility.

1 To be at a risk of acquiring HIV there must be HIV present in a bodily fluid. Semen (including pre-ejaculate) is known to transmit HIV. Taking your partner's ejaculate in your mouth appears to make transmission more likely (especially if there are any cuts or ulcers). Using a barrier such as a condom during oral sex can reduce the risk of transmitting HIV.

2 There are not enough reports on how long can the sperm survive in the oral cavity; factors like food and pH of the saliva can affect it (1) However, even if there is presence of ejaculate in the oral cavity; as long as there are no bleeding sores or ulcers in mouth the risk of HIV remains Negligible because essentially there is no direct mode of transmission to acquire HIV.

Recommendation: There are no evidence or no documented cases of transmission refer to Physician for more personalized answers .

Regards, AIDS Vancouver Helpline/Online, (Vardah)