When I was a younger I was a specific type of exhibitionist. My personal rules were that it had to be a situation where people weren't expecting it (no spring break, Mardi Gras, etc.), no one was taking pictures, and I had to have at least a little bit of deniability.
In college, when it was warm, I often went out without panties. This made me horny and usually no one was the wiser. One time the professor of one of my freshman seminars surprised us by asking whether we wanted to go sit out on the grass outside. It was beautiful outside, and everyone agreed. When he told us to sit in a circle, I realized that I was wearing a short skirt with no panties, so it was going to be hard not to flash anybody. I decided to make the best of it and sit across from a boy I thought was cute.
I was sitting cross-legged, and at first the guy I liked did not seem to notice anything out of the ordinary. A few minutes into the class though, it became clear that he DEFINITELY noticed.
To paint you a picture, at first he probably just saw a dark triangle between my legs. When I caught him looking he looked away, but then his eyes kept getting drawn to that dark patch. He seemed to be having trouble concentrating on the high-minded discussion going on. I think the professor noticed and he seemed kind of annoyed.
I was enjoying myself though so I decided to tease the guy a little more. Every once once in while I would shift my position and give him a quick, wide open look. He should have been able to see my c*nt lips and everything. At some point I think he realized how obvious he was being, and he stopped looking in my direction at all. This made me even hornier then having him stare, because I knew I had gotten under his skin.
When the class was over, I bet he had to go back to his room and jerk off. He never approached me directly, but sometimes I gave him flirtatious looks in class and always got a reaction.