Roger Ebert, quoting John Waters: "If you go home with someone and they don't have books, don't f**k them."

A stark tweet.

In the future, all the books will be ebooks, and it will be so much harder for Ebert and Waters to discern who deserves their sexual ministrations.

ADDED: One thing about books on the shelf is that you can check out the titles and form a rough opinion of the person. But that assumes the person really does read those books and that they don't have a hidden stash of books that — if you saw the titles — would send you running out the door.

What book, spotted on a prospective lover's shelf, would make you turn away and walk out the door?