I've had adult "public"sex so many times. There is a power that comes with it. I think part of the exhibitionism is the idea that you are proud to be you and you're going to do what you want and nothing short of (police) handcuffs is coming to make you stop.
If others don't like PDA, they can stop looking. Isn't sex in public just intense PDA?
All the way PDA.
Maybe that's the new name for my band