Media  Sexual compulsiveness rarely gets such a perfect balance of humor and compassion as inDon Jon. Jon (Joseph Gordon-Levitt) is a New Jersey lothario who opens the movie by confessing to us, the viewers, that even though he gets lucky almost every night, he actually prefers porn to the real thing. But a creeping dissatisfaction makes him wonder if sex could be more meaningful--and lo, into his life walks Barbara (Scarlett Johansson), a girl who resists his smooth approach and makes him wait. Is Jon truly smitten? Is Barbara? Or is she as swayed by Hollywood rom-coms as he is by porn? Every timeDon Jonseems to be headed toward a lecture about sex addiction or possessiveness, it deftly veers away. The characters are strikingly three-dimensional and resist easy pigeonholing.Don Jonis an impressive writing-directing debut for Gordon-Levitt, who is apparently unsatisfied with simply being one of the most appealing movie stars of the moment. The whole cast is excellent, including Julianne Moore, Glenne Headly, Tony Danza (as Jon's dad), and Brie Larson (United States of Tara), who says only a few sentences in the movie but makes an impression with a skeptical glance. All around, a delight of a movie that mixes surprisingly mature thoughtfulness with sly comedy.--Bret Fetzer