Does the infection percentage stay the same if you are receiving oral sex from a possible + person if they are on medication, as opposed to someone that does not?

that is a good question and i will try my best to answer.

first of all oral sex is considered a low risk activity. it carries with it about the same risk if you played a rough sport with someone +, basketball, football ect.... the reason why is that it is nearly impossible to trasmit HIV through saliva. there is one case of people with SEVERE dental problems, so it wasn't really saliva because their mouths were bleeding so bad. rough sports are about the same because a + person could get an open cut as could a negative person and then come into contact with each other. still a very very very very low possibility.

as far as the viral load goes, this IS true for high risk activities. the higher the viral load the higher the risk, but because HIV isn't really transmittible through saliva, it doesn't really matter to debate this because viral load is not measured in saliva.