There's a video on Youtube showing the inside of an NFL dressing room. You can see the naked players in the background.the NFL are such prudes.
I was looking for a pic or footage of the time Bears quaterback Bobby Douglass lost his pants trying to avoid an Alan Page sack. I still remember when it was aired, in slow motion no less, in an episode of Football Follies. Poor Bobby had nothing but his jock strap to protect him.