When I was about 15, I went to a new doctor for a regular physical, my first one after puberty.
As usual in Brazil, the doctor's office had a desk and chairs on one side and the actual exam room behind a partition. When I entered the office, the doctor was sitting behind his desk and I sat down facing him for the history/conversation part. He asked me the usual questions and took notes. I was an insecure teenager and even though I was very nervous, I took the courage to express concerns about my penis size, so he smiled and said he would take a look.
With history done, he told me to go behind the partition and I noticed the examining table was against a large window with thick, large curtains. He told to take my shirt off and sit on the exam table, then he did the usual checks: ear/nose/throat, reflexes, heart, etc. I knew what was coming next, and my heart was racing. For the moment of truth, he told me to stand up, and drop my pants and underwear to my knees. I was a nervous wreck because this was literally the first time another human being would see me naked after puberty. I hesitated for a second and when I finally complied, he opened the curtains in one swift move and said: "Ok, let's have a better look at this penis". I had a moment of panic when I realized I was facing the window completely naked as the sun brightly lit the room and my body. I was already self-conscious of my penis and didn't really need the additional spotlight. I remember I almost covered myself by pure instinct but somehow managed to calm down and stand there in all my glory.
Let me clarify that we were at ground level, and anybody standing outside would get a great view. The room faced the back there was nobody there, but the possibility existed and made me feel exposed, like I was naked on a stage.
First he just looked at me while standing from a distance in what seemed like forever but it was probably only a minute. Even though I was looking down from embarrassment, I knew he could see my whole naked body and was focused on my penis.
After the visual inspection, he sat down and carefully examined my penis and testicles. When he was done, he told me my penis was normal and even said I should be glad it was "thick".
I believe the large open window in the exam room certainly added to the stress of an already awkward situation.