Well, let's assume everybody knows that gaywargames is a porn site and it's nowhere near real.
Sill, it must be damned unpleasant for that guy to get his head stuck underwater like that. It's somewhat amazing what models will do if the pay is good enough, isn't it? This is one of the extremest I've seen.
Another place that sometimes surprises me is boundgods. I would have thought this kind of suspension would half kill the guys, but apparently it didn't: