Many men associate oral sex with safe sex. Oral sex includes stimulating a penis (blow job) or an anus (rimming) with your mouth.
Oral sex can put you at risk of getting one or more sexually transmitted infections (STIs).
HIV
To date there has not been a confirmed case of someone becoming HIV-positive through oral sex (blow job) published in scientific literature. However, it remains possible for transmission to occur if the person performing the blow job has small cuts or sores in his mouth and his partner cums in his mouth. There is no risk of HIV infection for the guy receiving the blow job. Rimming does not pose a risk of HIV infection, provided there is no blood present. Remember that someone who is HIV-positive, on ARV treatment and undetectable poses no risk of passing HIV onto you but other STIs can still can passed on through oral sex.