I did not live in a family where nudity at home was frequent, I had never seen my mother naked and seldomly I had seen my father naked but for him it was not so much embarrassing because he had been used to be naked at draft examinations and military service and certainly also at job examinations even if he did not relate it to me with details.
And I was very shy towards nudity and it was increased by the fact that I felt that I was too skinny, so I did not like to expose my body to the view of others.
But it was not an issue when I went to beaches where I wore only a short swim suit kind of speedo like all boys at that time.
I lived in Fance and at that time, the last 50's and the 60's when I was a pre-teenager , the modesty of boys was not a big concern.
So very soon , I was used to be submitted to compulsory physical examinations at school, each year from elementary grade to the last grade of high school, the school physical exams were performed at the beginning of each year generally at the second week of the year school , they were not optional, we could not go to see our private doctor's family instead of coming to the school exam, we were summoned by a letter sent at home to warn parents that we might be clean for the body and wear clean socks and briefs ( at my time all boys wore the same kind of briefs, a white one and short at the sides and rear )
The set up of the exams was generally the same at least for middle and high school , there was first a group undresssing in just briefs ( no socks, no watches nor any jewelleries were allowed to keep) which took place in a waiting room near the exam room , we undressed all together a group of 15 boys, half of the class, under instruction of the Pe teacher and we stayed in briefs until it was finished , the silence was required by the Pe teacher, then we were called by the school nurse and we were examined one by one mainly in the nude by the female nurse and the female doctor.
So I had a nervous anticipation of the exam a few days before but I knew that thre was no solution to avoid it , I disliked it but I complied to instructions , I presume that I was embarrrassed but also a little excited at the idea of being undressed with my classmates and naked in front of the nurse and the doctor even if I was not conscious of that feeling at that time, may be also the idea of being undressed in front of the Pe teacher even if he could see us also in the changing room for Pe and the shower area since a shower in group was generally mandatory after a Pe lesson.
I believe that I was never really enough used to undress at physical examinations to be comfortable but I forgot my embarrassment easily after the exam until the next year .
I did not go to sports exams in a club like some of my classmates but I knew that the set up was also that of a group exam like for summer camps , it was almost the rule at that time, officially to win time .. but certainly more because no adults cared about the modesty of boys, and most of them were thinking that it was good to make us be obedient and quiet ( it was admitted that boys behaved better when they were undressed in group than if they were clothed ? possibly true !), it was also logical as a preparation for draft examinations since all adults knew that when reached 18 age they would be summoned at draft examinations to decide of their fitness for the mandatory mlilitary service and they would be naked in group .
I had been submitted to a demeaning physical examination when I was 15 aged to subscribe to a sport association to learn swimming ( because I had not learned it at school, having been exempted by the doctor family for frequent sore throats at middle school) at the railway society where my father was working, it was free of charge for children of employees, so it was interesting to catch up my delay on my classmates at high school, but I was first submitted to a physical examination at the nurse's office where there was a big room for her and an other for examinations by a doctor hired by the society, the day was different for boys and girls , and we were summoned by similar ages, so when it was the day, I was gatherd in the nurse room with about 12 other boys aged between 13 and 16 and all accompanied by the parent who was the employee of the society, so for me and most of the boys it was the father but there was also some mothers about five.
It was anxious about that physical and I was right, since as soon as we arrived , the nurse, a strict middle aged woman ( my father who knew her because he had each year a compulsory exam with her had told me before that she was a bitch ", I did not know what it meaned exactly but certainly nothing good for me !) instructed us to undress until just briefs ( no socks , no watches )and leave our clothes on a bench while the parents were sitting on chairs opposite to the wall where we might line up very closely with hands on our sides , she had ordered it with authority to a boy who had tried to cross his hands in front of him, and she did a roll call while we stood already in briefs along the wall ( I don't not know why she had waited that we were undressed in briefs to do it, may be to obtain a bettter obedience and behaviour ? I do not see an other valuable reason or to embarrass us since she was a "bitch", just for the fun to have in front of her a line of boys in briefs exposed to the view of the parents, then she had explained to the parents that she would first proceed to the first part of the exam in public because she was used to deal in that way with boys ( of course it meant that it was different with girls which I learned later by a boy who had a sister also submitted to the exam by the nurse ) and that boys did not need the same respect of privacy than girls and might be prepared for their future draft examinations in a few years where they would have no privacy at all , which was approved loudly by some mothers...
So she did after some tests like eyes test , blood test, even a urine test in a small restroom at the back of the room without door and for which we were ordered to remove our brief, to put it on a stool, and stand naked because she wanted to wash our penis before we were allowed to pee one by one, with her behind us with our bare butt in plain view , and we knew that if the parents turned their heads towards the back of the room, they could see our bare asses one by one while she washed our penises.
But it was worst after since we might stay naked for a weigh- in in the middle of the room with a scale she had suddenly found in a small store room, it was done on plain view of all parents, she gave each of us a slap on the butt to climb up and down of the scale which made laugh some mothers, she explained to parents that the weigh in of boys might be made completely naked under requirements of the official medical form while that of girls was performed in panties, and that it was normal for boys because it was more accurate, and anyway we did not need to wear a brief , we had nothing that she and any parent had not already seen , she was approved loudly one more time by mothers, and that we might get over our stupid shyness, she took our height with a measuring height gauge and she did some other measurements, and after we lwere ordered to line up stark naked, always with hands on our sides, on the wall face to our parents, and we waited to be called one by one by the nurse to see the lady doctor, who did a complete exam from head to toes and we had to walk and do some exercices in the exam room , all in presence of course of our father for me, or mother for some boys and in presence of the nurse who took notes on our medical form.
It was the more embarrassing exam that I remembered as a teenager but now when I think about it I remember more of it as ridiculous .
I had heard at that time that it was the same for boys at the entrance at military schools or for some boarding schools, also with the set up of group exams at least for undressing and sometimes for all the exam like at the army , even for summer camps ..
And at 18 age of course I began with the dreadful draft examinations performed in the nude.
So I have had a lot of medical situtions where I was embarrassed to be naked until I became more comfortable as an adult with nudity in medical situations