Reviewed by GREG KING Director: Paul Weitz Stars: Jason Biggs, Chris Klein, Thomas Ian Nicholas, Natasha Lyonne, Tara Reid, Eddie Kaye Thomas, Mena Suvari, Eugene Levy, Shannon Elizabeth, Chris Owen, Seann William Scott. A Porky's for the '90's? Although this raunchy but very funny adolescent comedy explores problems of adolescent angst and the sexual follies of youth, it does so with more honesty, …