I've only been exposed by accident. It was my senior year of high school. I was wearing my school uniform and I had not worn underwear that day. The pants were pretty thin material. Not noticibly, but they felt thin. All of a sudden, down comes the rain, pants get wet, visible outline detected by everyone I walked past. The youger guys kept quiet about it but some of the people I knew better in the upper years would pass comments. Sadly it was an all boys school so in the end I did cop a hammering, but on the positive side, nobody ever directed a penis insult at me afterward.