Every novelist understands that the sex in his book is his hostage to posterityGeoff Dyer has written a book about D. H. Lawrence (Out Of Sheer Rage) and a book about photography (The Ongoing Moment), and in the latter he combines these two areas of interest in a disquisition on Georgia O'Keeffe's pubic area. This is apropos the famous photographs by her lover Alfred Stieglitz. Mr. Dyer is dissatisfied by the "mass of ink-dark shadow" with which the happy snapper renders her, ah, naughty bits (not the word the author uses), and compares the impenetrable jungle of Miss O'Keeffe's pubic...