As a "ethical" exhibitionist (as in I like being naked but would never do it to someone unwitting) with a somewhat exhibitionist wife, its been a bit of a joke of mine to tease my wife about this. While for us there is no way to really calculate how many have seen us full Monty, its been in the 1000's in person, I'm in the 10's of 1000's from online and my wife is at least at 700k online, probably more. (One site had a view counter, the rest just an average). And while I'm kinda shameless, shes still almost as shy now as the first time and never would be the only one nude in a public situation. I'm guessing this number is between 0 and millions out there (we know someone personally with millions and millions).