The thought of having a nurse/ MA chaperone or witness my exam would be so embarrassing and awkward at the time. However, I also think it would be completely worth it because the memory of it would be so arousing to me afterwards. Just the thought of the nurses knowing or hearing what my doctor does to me behind closed doors embarrasses me, yet turns me on. To have them in the room watching really excites me. IRL, I've never had a doctor use a chaperone, except at the dermatologist. Those have always included a female MA as a chaperone/ assistant/ scribe.
I went with my wife to most of her ob/gyn appointments while she was pregnant. The first exam was a full gyn physical (because she was overdue), later in the pregnancy was the fingers exam to check for dilation. Those were always a turn on.
Having my wife witness my exam is mixed emotions to me because she's not into medfet at all. It is still embarrassing and awkward (which I love in my medfet), but it doesn't quite have the same arousal factor as having a stranger witnessing me. However, her presence usually calms and relaxes me a bit, which is always nice. I also like her there to help me relay and absorb any information that is discussed.
Years ago, she had a front and center seat watching me receive a surprise genital exam at the urologist. She was also standing right next to me when I was given a catheter, had one removed, and was given a suppository. All those times were slightly embarrassing and slightly arousing, but surprisingly her presence didn't really add to either.
Recently, I had an upcoming appointment to see a colorectal specialist, and I was really dreading, yet looking forward to the sensations and embarrassment I knew I would receive at the exam. A couple of weeks out from my appointment, my wife insists she is going to go with me. The thought of her there witnessing that mortified me. At the same time, I think that feeling somehow overshadowed my arousal for the exam. Now I was just dreading it all. A day or two before the appointment, she casually told me she was going to stay in the waiting room. She figured it would be an invasive and embarrassing exam and knew her being in there wouldn't exactly help matters. After my exam I was able to bring her back with me while we all discussed options and timing. So it ended up being the best of both worlds. Me getting to experience my arousing embarrassment, and her calm, knowledgeable presence afterwards.