If you live in the U.S., obscenity laws are generally written by and apply to various, individual communities or states. Under Reagan (Ed Meese) and under W. Bush (Ashcroft), the government did go after porn producers and even actors pretty hard. But under Clinton (Reno) and especially under Obama (Holder), I haven't heard that there's been any major prosecutions since he took office. Other than the obvious things that would get federal attention (snuff films, kiddie p0rn, etc.), the legal disclaimers on a site (any site) don't have anything to do with what's "legal" in your jurisdiction. Where I live, a truck driver got stopped for speeding/reckless driving several years ago. And he was charged with possession of obscene material for having some porn mags and DVDs in his truck. A cop friend of mine said it was nothing crazy, just "normal porn" type stuff. But here in the Bible Belt, that stuff violates the community standards. Don't know if the charges stuck or if he took a plea - never heard what happened to him. And the man who ran for governor of my state (and thankfully lost!), Ken Cuccinelli, the current Attorney General, was trying to find a (legal) way to charge people in my state with a crime if they could be found to be viewing or purchasing porn over their internet connections.
Not to make this political, but folks, there's the "smaller, less intrusive government" crowd for you in a nutshell - with nut being the operative word.