Obscenity is not protected freedom of expression. "Vanilla" porn is generally not considered to be obscenity. Child porn, rape, etc are obscenity. However, jus

Obscenity is not protected freedom of expression. "Vanilla" porn is generally not considered to be obscenity. Child porn, rape, etc are obscenity. However, just because something is protected does not mean you cannot require an ID. If that was the case then it would be unconstitutional to require an ID before buying a gun.