Colleges and universities used to teach art history to encourage connoisseurship and acquaint students with the riches of our artistic heritage. But now, as Roger Kimball reveals in this witty and provocative book, the student is less likely to learn about the aesthetics of masterworks than to be told, for instance, that Peter Paul Rubens' great painting Drunken Silenus is an allegory about anal rape. Or that Courbet's famous hunting pictures are...