It is logical to assume that the risk of transmission is higher (for the oral partner) with ejaculation than without it. However, there are no data one way or the other; your comment about the difficulty of knowing is spot on.
There are no data on HIV transmission by rimming, for either the rimmer or rimmee. My speculation is that it is very low risk in either direction.
HHH, MD
Just as follow up, would not taking ejaculate versus taking ejaculate lower the risk? One would think so, but I imagine it would be rather impossible to complete a study on it.
Thank you.
What about oral-anal or rimming? What are the chances of contracting the virus through that form of oral sex? Receptor vs giver? Anything been proven on this, speculation, or there is no chance? Thanks.
Man, I love getting articulate, well thought-out questions that have teaching value for most forum users. And thanks for the thanks about the forum.
There is no clear answer to how people should deal with conflicting information on public websites. But good clues include who runs the site; whether "facts" and opinions by the public are permitted and, if so, whether those comments are monitored; and the extent to which the people or agencies that run the site show evidence that their advice and information are based on data, not "common sense" or personal opinion. By those criteria, you can rely on outfits like the CDC, the American Social Health Association, thebody.com, and those with affiliations with public health departments, like gay.com and Jeff Klausner (Dr. K). And, frankly, this site.
Oral sex is of such low risk for the insertive partner (the one receiving the BJ) that HIV transmission has never been proved. There have been claims here and there, but sometimes there is reason to question the truth of statements about lack of other exposures. Transmission to the receptive (BJ-giving) partner clearly occurs, but is uncommon. It simply is very rare to see people with newly acquired HIV who give believable histories of oral sex as the only exposure, and the overall risk is clearly less than one transmission in 10,000 exposures, when one partner is known to have HIV. On average, how long would it take to get infected if someone gave or received oral once a day with HIV infected partners? Do the math.
Few prevention experts recommend routine use of condoms for oral sex. Not only are the transmission risks low, there is fear that if people hear a message they cannot have any sex at all without condoms, even oral sex, there will be a tendency to disregard them for all sex, which would be a disaster.
You are being very safe in general, in particular in routinely inquiring about partners' HIV status. Nothing is perfect, and nobody can guarantee you won't get HIV by oral sex. But the odds are strong that you'll never acquire HIV if you continue as you are doing now.
Good luck-- HHH, MD