I do see the concerns of the original poster with respect to sitting bare-assed on chairs being sanitary.
I don't think getting embarrassed about
being exposed is something to worry about
. The medical staff gets plenty of that, even though they are human. It's par for the course, IMO.
When I had my biopsy, the male doctor did it, but he had two interns watch the procedure. The doctor asked my permission, and I gave it. I figure, if it helps someone learn, that's a good thing. And I've seen a lot of things more pornographic than putting lube and a condom on an ultrasound wand, so I didn't give that a second thought either.
My pre-surgery MRI was rectal, and quite a few people got an eyeful.
When the urologist gave me an in-office penile injection, he had a very attractive and young female urology intern watch the whole process of injection and testing of the firmness of the erection. He asked my permission as well. I was happy to do it

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Prostate cancer diagnosed: May 15, 2006 (age 40)
Gleason score: pre-surgery 3+3=6; post-surgery 3+4=7
daVinci radical prostatectomy: July 25, 2006
size of tumor: approx 1.1 inches; negative margins from surgery
- number of pads/day at 3 months after surgery: 3 to 5
- number of pads/day at 4 months after surgery: 1 to 2
- number of pads/day at 6-18 months after surgery: 0 to 1
- 1st post-surgery PSA: 0 (Nov 2006); 2nd post-surgery PSA: 0 (Feb 2007)
- 3rd post-surgery PSA: 0 (May 2007); 4th post-surgery PSA: 0 (June 2007); 5th post-surgery PSA: 0
The search for timber: took Viagra/Cialis approx. every other day, ErecAid once a day, injections. Peyronie's diagnosed 7/5/07. Now on daily Cialis, L-arginine and pentoxyfylline. Peyronies has stabilized and significantly reversed.
- PGE1 batting average: .364 (4 for 11)
- Bimix #3 batting average: .722 (13 for 18) Bimix #1 batting average (8 for 8) = 1.000
- Trimix batting average: .500 (1 for 2) Grand total 26 for 39 = .667
"Lost in the valley without my horses, no one can tell me what my remorse is..."