I would love to experience the awkwardness of an unwanted erection during a medical procedure. Sadly, despite my arousal associated with the idea or the actual experience of being near or fully nude in a medical setting, I have only experienced erections a handful of times that I can recall. I recently had to be prepped for surgery with a inguinal hernia. I was as concerned as I was hopeful that I would suffer the embarrassment with an unexpected erection. The prep nurse lifted my gown to gain access to my body to shave me from just above my nipples and all the way down to my penis. When she got to the pubic area, I was concerned that I might get erect from the contact of her moving my penis back and forth to shave the hair in the nooks and crannies. Sadly, while I felt it engorge a bit, it never really lifted to an erect position.
The one incident I do recall is when I was maybe 16 or so, I was with my mother present at an annual check up. The pediatrician had removed my underwear to move onto the genital exam, leaving me lying on my back in the nude with my penis fully exposed to my delight. He began the usual inspection of my anatomy when he noted a calcified little piece of skin on the underside of the trunk about half way between the tip and the base. I used to fuss with it on occasion, rolling it around in my fingers. It was kernel like, no more than a half of a millimeter.
He focused on it for a second which got my attention. I asked what he thought it was. He asked at that point if I wanted my Mom to leave while he took a closer look. I did not really care, but for some reason I was worried about not requiring her to leave, like maybe it would be weird if I came off as not worried, so I nodded reluctantly and she left the room. He stepped out for a moment and came back wearing headgear with a light and magnifying bifocals. He then proceeded to more closely examine it through the magnifying glass. I just remember the feeling of him manipulating my penis this way and that until finally, to my horror, my penis literally sprung out of no where from soft to erect in a split second.
I must had a look or something because he said something like, "Don't worry, that is normal," and carried on as usual, continuing to manipulate the position of my penis for a closer look. He, too, rolled the thing between his fingers to assess the construction of it. I stayed erect through the inspection which probably only lasted a minute or so. The doctor concluded that it did not appear to be anything of concern, and suggested that it is more than likely left over from the circumcision procedure performed when I was an infant.
Aside from that incident, while I recall being concerned when my penis suddenly began to engorge, sadly, I don't recall any other circumstances where I was erect during an examination procedure. I would love to be faced with the embarrassment of experiencing such, though. The embarrassing aspect of growing erect while having my penis examined is very arousing.