hello NCliep, I agree with MOD11. Seek professional consultation
(and try to go to a private doctor`s office, because when we work in clinics we are more concerned about finshing the medical attention rather than allayiong people`s fears and talking to them).
I will put my PERSONAL recommendations below. Keep in mind I am not dispensing professional advice here, just private opinions, although, I DO have professional training in these matters.
1.STI`s frmo , if you are receiving oral sex, IE you are being sucked, very little risk (almost none) of HIV infection (unless someone is really bleeding at teh mouth, but poeple know when they are bleeding at teh mouth and so would you so really really have ot be obvious). So I would not worry about that.
2. Other STi`s like gonorrhea, syphilis can appear. They are treatable, gonorrhea usually has as symptoms painful discharge of urine, and syphilis has a chancre on the demal layer of the penis.
3.Herpes, is possible but not likely, happens when the woman is having an outbreak or near one.
Basically in reality the only risk you have to worry about is herpes. What you can do if you wanqt lowered risk is to have have teh condom half way up, so that you can collect teh cum, to not put your prtner at risk.