Looking for the dirty thrill of ogling a real porn star, Sasha Grey, as she plays a high-priced Manhattan hooker doing a suck-fuck Kama Sutra? Then, dear God, steer clear of The Girlfriend Experience. Grey, 21, is there, all right, but director Steven Soderbergh, 46, has no interest in servicing the panting john in us. His movie, stylishly shot on the high-def cheap, runs 77 potently sexless minutes. Its subject isn't erotica, it's commodities trading. The time is a few days before Obama's
