I don't wear underclothes at all and here is the reason why:
When I was in primary school in the beginning and went to the toilet to have a pee, I was usually to late and wet my pants and that was very very down grading for a child like me that was a bit shy. In grade Secondary school one of our teachers told us never to wear undies hat are too tight. That according to him would give you "smallballs" and would make you sterile. It gave me such a fright to think that I could get sterile by wearing undies that I decided that was it, never will I allow That to happen to me. I used to get dressed with undies, go to school and straight to the toilet and get them off. Before going home, I would go to the toilet again and put them on, just in case my mom would see me getting my clothes off and realize that I didn't wear any.
Since out of school I've never thought of going back to wearing any and don't even own an underpants.

Is there anybody else on SYD that feels the same? (by the way, why should one wear any clothes apart from staying warm)