I remember two situations:
First was at my very first visit at a new dermatologist for a complete full-body mole exam, when I was 13 yrs. old. The doctor talked to my mom in the exam room first, then I had to undress everything, one garment after the other, so that I stood completely naked infront of the doctor and she did an inspection of my whole body first and palpated on many of my hundreds of moles; it included also an inspection of my penis and glans, where I have a few moles, too, and while she palpated the one on my glans, I got my very first erection, I can rememer ever! I had to turn around then, so that she began to inspect my back, so that my front side was looking to the door! After a few moments the door opened and another nurse came in to bring something and let the door open! Outside, a girl from my school (from a parallel class) was sitting and saw me standing completely stark naked for a short while! At that moment I wished the ground would open and swallow me up.
The second situation was during my nursing education, when I had to see the company doctor for a full body exam every half year. I always had to undress completely to my pants for these exams and at some of these exams, she let be done an electro-cardiography (ecg) by a nurse, too, so that she took me - like I was, only in my pants - from the exam room through the waiting area into a small room for the ecg on the opposite side. Often, other nursing students, which knew me from the nursing school and the nursing rooming house, sat in the waiting area, too, and saw me passing nearly naked the waiting area with the doctor. At that moment, all conversation in the waiting area stopped at once, all were looking on me and some strated whispering then. Sometimes I had to wait further more while I was lying on the ecg-exam-table for the nurse, who did the ecg then. Sometimes, the doctor did not closed the door of the ecg-room completely, when she left me alone there. So, few ones of the nursing students could see me lying on the table there! I saw like they were looking to me and heard when they were talking about me!