Devil's advocate here. She's "concerned...wants to maybe ask questions..."
Yeah, no. This is latent jealousy and insecurity, and she just wants to make sure your (FEMALE, all caps for Susie) urologist isn't going to make you sprout wood on the exam table, or worse, spontaneously dump the kids on the floor hands free.
I sincerely doubt your wife will find the situation uncomfortable because the physician is a woman. I expect she will take it in stride and not give it a second thought.
Have to disagree (politely). Based on OP's previous statement:
Doctors are a sexual trigger for me, my nervousness is all in my head. The difference with this revolves around my wife being present in this weird mental space for me.
, this is EXACTLY why she's asking to attend the examination. Yeah, maybe she's worried you might have functionality issues, or long term health risk "down there" but c'mon - that's not it and you know it, or you wouldn't be asking. And oh by the way, chances are VERY good the female doctor will ensure there's a chaperone (nurse, orderly, intern etc) in the room when she's examining you anyway. Mine always does as a matter of clinic policy (and yeah, sadly, the chaperone is a male). And you can always request one.
Tell the "concerned, interested, question having" Mrs. that and watch her hamster wheel start spinning. She has no fucking right to be in that examination room. Remember "my body my choice?" It works both ways. Tell her to fuck off already, or you intend to be present at each and every one of her future pap smears and pelvic exams. (INB4 "she'd probably like that" from countless other Zity members).
On the other hand, it could be an opportunity to rack up yet another illicit Zity-worthy public boink session. After the exam is over, lock the exam room door, put HER in the stirrups, practice your pelvic exam techniques and knock the bottom out of it before the nurse comes a knockin'...
Then you know, tell us kinksters all about it here...