It's obvious that Paul Walker is hot—as a tuxedo-clad collegiate in The Skulls
or racing souped-up cars in The Fast and the Furious
. But on any given sunny day, the fanatical surfer is also quite likely burning. Sunscreen? "Forget it. I feel like a girl putting lotions on," says the onetime Pampers model. "I've tried, but I can't do it and feel right about myself. Nobody else is complaining about his casual attitude. Before filming began on Skulls
, "he had scruff," says costar Jordana Brewster. "Paul looks really good when he's rugged." And when he's not, "It doesn't matter whether they're 18 or 38," confirms Rob Cohen, director of Skulls and Furious
. "You can see the hunger in women's eyes." Walker, 28, now filming the sci-fi drama Timeline
, works off his own yearning—for cheeseburgers—with snowboarding, basketball and plenty of surfing near his L.A. home, but avoids the gym. At 6'2" and 185 lbs., "I'm already too thin," says the bachelor, who has a 3-year-old daughter with an ex-girlfriend. "If I lost weight, I'd be two-dimensional!"