A motion picture, or music, or television, they have to maintain a certain decorum in order to be broadcast to a vast audience. Other forms of mass media cost too much to produce a risk reaching only a limited audience. Only one person. But a book. . . . A book is cheap to print and bind. A book is as private and consensual as sex. A book takes time and effort to consume - something that gives a reader every chance to walk away. Actually, so few people make the effort to read that it's difficult to call books a "mass medium." No one really gives a damn about books. No one has bothered to ban a book in decades.