I just started gym class and we have to change into tighty whities the week we run the mile everyday as our teacher says we need to protect our you know whats. We all change ut of our boxers and then have to line up in only out whities for the teacher to check. Well, all the guys who would never be caught dead in them are very slim and sculpted and even know I am a very straight guy, standing their in my whiites with 25 other guys in their tight whitites, I got a boner like you can't believe, even in them. It was quite obvious to everyone including the teacher when he looked at me. I was so glad we put our clothes on. But then later some guys showered in their whities causing me to get so hard infront of everyone. Now everyone thinks I am gay.