LordCrash I don't know too much about Legal Porno, but from what I've seen from "gray area" paysites (ie, with themes that push the line), they are VERY careful with the wording they use on the site and in their movies to push the 'processing OK' line at times, but never cross it.
Per non-USA, sure, EU can make their own credit card from scratch if they want. It will only take many billions of dollars. And it would be economic suicide for SLR or most any site to solely focus on this region while not accepting major credit cards. Fortunately, while a 'EU card' does not seem to be happening, there are more and more alternative payment options and perhaps we may get to a point where a paysite could theoretically attempt operating without accepting regular cards, but that day has not yet arrived.
I think at the end of the day--and data from what I've seen backs this--most users don't really care about out of the box content. Most simply want to see vanilla content of pretty people having sex together. Please keep this in mind.