I am a gay male but mostly engage in just oral sex (although multiple partners). how often should i be tested for hiv?

You are correct: that oral sex is significantly lower risk for transmission of HIV As you also suggest, the risk is not zero. I would be remiss if I didn't first advise you to practice entirely safe sex all the time!There is no consensus protocol for frequency of testing in this situation. If I were you, and had accepted a degree of risk already, I would probably test every 3-6 months, probably 6.Playing with fire