It happed in school when I was 13. Once a year we had to undergo a compulsory physical check up in the school's infirmary. My parents enrolled me in that school and had no idea every student had to go through that, till I found out through other boys. They told me it was embarrassing because they had to take there clothes in front of a female nurse. Almost died when they said it was completely naked and saw the nurse a few days later. She was young, pretty and couldn't stop thinking of her seeing me naked. They day came when they began excusing student out of class and sent to the infirmary and went cold when my name was called. I remember walking into this room with a bed covered in paper, the nurse telling me to get undressed and thinking about bad things to keep my dick down. She was totally unfazed about my nudity as she examined me from head to toe. So unfazed that she walked out to get something, living the door wide open while a girl from my class was sitting out there waiting her turn. She just sat there giggling, gazing down at my dick and seemingly enjoying herself. It happed so suddenly I stood there frozen with shame, with everything hanging out till the nurse came back. She didn't even realized the embarrassment she had just put me through and continued with her examination. Every day in school was an embarrassing one for me, having to sit in a classroom with a girl that had seen me stark naked. My face turned red every time I looked at her smiling back at me. She knew it was something that I would never talk about and felt visibly a ashamed about. She kept sending me dirty notes telling me her girl friend wanted to see naked and threatening to tell other girls witch would have turned me into the laughing stock of the whole school. She basically forced me to do it just to keep her quiet. Figured it would be less embarrassing than having everyone finding out and agreed to do it. Remember her note telling me to stay in the classroom during break time, locking the door and standing with my pants and underwear down in front of two of her girl friends watching me getting a boner. As embarrassed as I felt, having girls looking and touching, I could stop myself from getting a boner. It just went rock hard and knew it wouldn't be the last time I would be forced to do it. A long time has passed since that happed and I guess it was my first sexual experience. I still remember their names and the thrills they had doing it. Thank God I only spent a year in that school or I would be still exposing myself to those shameless girls.