My post mainly deals with HIV.
Safe Sex With Another Person
No anal, oral and rimming would come pretty close to safe sex. Rimming without protection is not hazardous for HIV but other infections (e.g. hepatitis, parasites).
Safer Sex With Another Person
Oral sex without a condom if you are the one performing the blowjob is low risk, but you can get infected that way (I did). Cuts in the mouth cavity can be an entry point even if the person does not cum in your mouth. Pre-cum has just as high a concentration of HIV as cum. Anal sex with a condom that is used properly (lots of lube, right size, not expired). Using a dental dam or a condom while rimming a guy.
Anal sex without a condom is not a good idea, especially if you are the "bottom." If you are the top and you are wearing a condom then your risk of contracting HIV is less than the bottoms even if the ocndom breaks.
Finally the best way to learn about safer sex practices is to do your research on line. "TheBody.com" is a great website. I personally also use the AIDS Committee of Toronto website as well.