Prep and Truvada don't protect customers from std's. If your MT is known for sucking, getting sucked or penetration without a condom and he's sucking, getting sucked or penetrating 10 customer dicks/asses a week, how long can he possibly work before he needs to see a doctor? How long before his customers need to see a doctor, too?
Yes, a tad beyond the subject at hand, but let’s do the full disclosure reality of our adventures. The antibiotic shot for gonorrhea is one of the most painful I’ve ever had. At least the masseur was a standup guy and called after seeing his doctor.