A group of parents bicker about how sex education should be taught to their      fourth-grade children, yet seem incapably of maintaining their own sexual        relationships, in this smart and very funny Chilean film. Called no less than    "the most successful Chilean film ever" (La Segunda), Boris Quercia's    bawdy comedy follows three couples who swing wildly back and forth between     fidelity and unrestrained erotic passion. In Spanish with English subtitles.   Boris Querica---Chile---2003---107 mins.