It's become kind of a cliche, famous actors playing the physically or mentally handicapped as a kind of sure-fire Oscar bait. Yet you've got to give it up for John Hawkes in "The Sessions": He plays Mark O'Brien, a man paralyzed from the neck down who's forced to spend most of his time in an iron lung, yet who decides he wants to find out what sex is all about, and hires a sex therapist (Helen Hunt) to teach him. (Japan's Eirin has given this an R-18 rating, not due to anything graphic on-screen, but apparently in general opposition to the whole concept.)