I just saw that scene in "Masters" where they had the "viewing device". One of my favorite scenes was when he filmed his assistant masturbating completely naked...
I'll have to acquire some testing equipment for modern "Masters and Johnson" play scenarios. I was thinking of a vital signs monitor, as it would be fascinating to watch the patient's BP, pulse, and respiration go up as she got excited.
For the first test, the patient could be asked to masturbate totally naked on the exam table while being filmed. There would be a timer clock in the background to monitor time to orgasm in addition to the vital signs monitor.
A week later the patient would return for a second test, which would be similar to the first, but this time she would be given a dildo. Evey subsequent weekly test would introduce another variable: a vibrator, a gentle e-stim machine, while watching porn, while looking at a picture of her significant other, while using a rabbit, a fucking machine, etc.
The doctor would be strictly clinical of course, and would only monitor the camera and vital signs. He wouldn't directly help the patient achieve orgasm once the test started.
I think this would be a fun way to introduce female orgasms into realistic exams (I'm sure some doctors must study female sexuality), and as a side benefit, it would allow you and your "patient" to explore new stimuli and determine what excites her the most.