Kepler, we're talking about a sex video here, not a Hollywood film.
But if you check the site you'll notice that most if not all of the vids seem to have been filmed in Eastern Europe, Czech Republic to be precise, so I doubt that they're worried about any legal problems. Just check out the amount of 'amateur' porn coming out of that part of the world these days. It seems that there is an endless supply of hot babes over there willing to do almost anything for a buck.
But I wouldn't try doing the same thing in the US or Canada. For one thing, employers here are already checking job applicants facebook and myspace pages and blogs for possible problems. I don't think they would be hiring anyone who was on one of these sites if they came across them.