I think the spirit of this question is first genital exam after reaching puberty. So I'll tell that story.
I had pediatrician appointments in which the doc examined my genitals which was no big deal (except it was done in front of my mother). My last genital exam by the pediatrician was at age 8.
I don't think I had another genital exam until age 15, which was my first genital exam after puberty. I had very poor body self-image at the time, and no one had seen me naked since reaching puberty. One day, my parents made an appointment for me for a general physical exam. Turns out it was that same day! They gave me no notice. I think they didn't want me to get nervous. I was petrified. Also, this was back in the early 1970s when doctor's appointments were a really big deal. Here's the story.
I arrived at the doctor's office (my mother drove me but waited in the waiting room). The medical assistants drew blood and took a urine specimen. They then did a chest x-ray (routine at the time, but I had never had one, so that was scary too). The medical assistant took me into another room with various equipment and had me take off my shirt, shoes, and socks. She did a pulmonary function study on me and also an EKG. She also took my height and weight and blood pressure.
Next, the medical assistant took me to the examining room and told me to take off my pants and wait for the doctor sitting on the examining table in my underpants. I was really nervous by then but thought: “Oh well, he'll probably just listen to my heart and lungs and examine my throat and then I'd be done.” WRONG!
The doctor then entered the room and proceeded with a thorough medical examination, head to toe. It included range of motion evaluation and neurological evaluation, which meant I was standing or lying on the examining table, doing various things in front of the doctor in my underpants.
Then the doctor, seated on a stool, told me to stand in front of him and drop my underpants to the floor. I was shocked! I did as was told and my post-puberty body was revealed, humiliation and all. He examined my penis and scrotum, including opening the meatus (I think they look for the texture of the mucous membranes in the urethral opening). He did the turn-your-head-and-cough thing. Even more shocking, he told me to turn around and bend over. He then spread my cheeks and visually examined my anus, but did not actually insert his finger.
The findings? He told me I had poor posture, which I should work on, and that I had hemorrhoids, for which I should use suppositories on an as-needed basis. The hemorrhoids are another story, which I think I've described elsewhere on Zity.
My next physical was two years later, same doc, for my college entrance physical (yes, they required those back then). I heard the same lecture about posture but the hemorrhoids were much better.