The gay doctor appears to be teaching a form of reflexology. The purpose of holding the head in a certain position while gently extending the spine is to realign the spine. Then he was showing the class certain pressure points for pain relief.
I think if the hot patient was given a bit of anesthesia, the students could entertain themselves and leave a lot happier. I know it would certainly cheer me up.
Notice how the doc rides against the ass of the middle guy first!
I've been playing doctor like that since I was 10.
Dunno whether I'd like to be doc here with a hot well-hung subject like that, or the subject getting harder with each grope close to my joystick.