Wish fulfillment.
My boyfriend and I share dreams like this. We both want to just walk somewhere naked but never had the guts. He is very well endowed and would love to show him off.
Last summer he approached me and said..I'm going to fulfill our dreams. I new exactly what he meant. He drove us about 30 miles north of town and pulled into a park that was a nudist camp. We both got undressed and arm in arm we strolled across the park. It was invigorating and exciting. Our next goal is to walk in a shopping area, however we haven't figured out how we can keep from getting arrested.
Next time you're taking a shower in gym class, just tell a few of your friends how you had a dream where they threw you out in the hall buck naked and locked the door.
There's a good chance they'll do it.