Q: I have been given blowjobs by many guys before, but lately I've noticed a few small blisters on my penis that are neither painful or itchy. Do I have an STI?

A: You may have gotten the blisters from several sources. One of these may be from unprotected oral sex leading to an STI such as herpes. Another reason could be that there has been too much friction between your dick and your partner's teeth. You should definitely see a doctor or go to an STI clinic or community health centre. They will be able to diagnose your condition and prescribe a solution or suggest an alternative. In the meantime, use condoms and refrain from sexual activities that involve your penis and another's bodily fluids as blisters and sores are key to HIV transmission via the bloodstream. It also puts you at high risk in transmitting your STI and becoming infected with someone else's diseases.