This guy got 48 months in prison for producing/selling obscene videos. He cited "2 Girls, 1 Cup" in his defense (produced by a Brazilian, and not prosecuted), and the unit responsible for going after obscenity on the Internet, under George W. Bush, has since been disbanded -- this was the last prosecution.
The videos are quite disgusting, but I think it sets a dangerous precedent to prosecute for adult obscenity.