I am not posting this question to question my "no risk" encounter. I just want to help ease my anxiety by learning about how HIV transmission could take place in oral sex.
I understand that HIV is transmitted from one person to another through either blood, semen, pre-cum or through mother's milk to baby.
Since my anxiety is specifically in insertive oral sex, I want to understand why it is a no risk situation. So for the insertive partner to be infected, there first needs to be blood in the giver's mouth and there needs to be enough blood so that the saliva is not able to neutralize it in time before it gets to the urethra. Now if blood gets to the penis opening, what else has to happen for transmission to complete? Does there need to be blood with virus still intact only and that virus gets soaked into the opening's membrane?
And how much blood would be needed in order for this kind of transmission to occur?
Also, what if the giver has very little saliva and is not able to neutralize the virus? How much saliva is needed to keep the act "safe"?