I'd known the Doc for several semesters, and we'd do small talk during my breaks. She was taking the once-a-week life drawing classes at State University and I was often the male model. It was an ongoing recreational art class in the evenings, no credit, just a means for art students to get in more time with a live model.
After a 20 or 30-minute pose the model gets a five-minute break, and I usually put on a robe and mill about, looking at the students' various interpretations of the pose. The Doc wasn't too bad, said she found it helpful with her anatomy and recommended these life drawing classes for her med students.
In fact the Doc said she had a business proposition for me. She told me some of her students were inexperienced and she wanted them to get used to touching a patient during a physical examination and since I was so comfortable being nude in front of groups of people I might be able to play patient for her class. She said she would be demonstrating the physical examination on me and then would have the students repeat it. This was certainly a new gig, but I was game so the Doc said to meet her at the Medical Arts Building the next day.
When I arrived at the Med building and stripped down, it felt a little strange because this was a clinic setting and not the usual art studio. The Doc had me put on one of those paper examination gowns then sit on the exam table while she examined my head and neck. There were ten students in the class, seven men and three women. One after another the students came to put thumbs to my trachea and push in on my thyroid lobes. They all looked into my nose, throat and ears, shined lights in my eyes and the Doc said that maybe I should be paying them because I would be getting a very thorough physical.
The Doc had me lower the gown to my waist and they all felt, poked, and pounded on my back and chest. All this physical touching was starting to feel pretty good, especially when the Doc told them to repeat the procedure. I was getting quite relaxed when the Doc had me lie on the table and they examined my feet and legs, lifting and bending them with range of motion examination.
Of course the paper gown by this time had become a folded up band at my waist and I was pretty much hanging out while the students were moving my legs around. I felt a little blood rush to my dick and immediately quit thinking about it and probably blushed a little as my embarrassment wilted the beginnings of a hard-on. However, staying soft was about to prove even more difficult as the doctor was instructing the class on examining my penis and scrotum.
As usual, the Doc was the first one to do the examination while showing the class. They were all standing at her side as she picked up my penis in her rubber-gloved hand and moved it around examining all sides. It was all I could do to keep from getting hard. I looked over everyone's head but I could feel that my dick was getting thicker even if it wasn't a full boner. Finally the Doc moved to my balls and did a testicular exam. I was still holding it down while she rolled my balls thru her fingers feeling for any lumps with the class looking on.