Girls, girls, girls. And well-endowed boys. They're the subjects of Thomas Ruff Nudes, a book of photographs by a well-known German artist best known for his searching images of faces, night skies and architecture. The new photographs were pulled off Internet porn sites and enlarged, colored and blurred by the artist. The fascinating thing about these nudes is the way the indistinct tumble of imagery replicates the physical sensation of sex. Everything is hazy, incomplete, replete with longing--a giddy carnival of orifices and sex organs. Skin is suffused with the blush of sexual arousal. Women offer themselves to unseen men and to one another. Some might say that Ruff is "making a statement" about the easy availability of pornography. Nonsense. He is documenting, in his painterly way, the elemental human urges that attract us to each other's flesh. The most interesting images in the book are the most abstract, revealing sexual appetite as the eternal pursuit of another body's knobs and holes. Accompanying the photographs is an earthy, supposedly fictional, fragment by the controversial French novelist Michel Houellebecq. The narrator reminisces about the years when he and his wife visited sex clubs on the Riviera. He writes of "dark rooms where people make love without choosing partners, submerged in the flux of tactile sensation." This is the world of Ruff's most successful photographs, a place where the staginess of pornography is transformed into the realm of pure desire. --Cathy Curtis