Almost every parent of a teenager wonders how on Earth they're going to be able to monitor what sensationalistic media images or ideas children are engrossed in today. On the radio, a pop singer boasts about her chest as a "milkshake" that brings all the boys to her yard. On the television, kids can see WB's "The Surreal Life," its sleazy reality-show plot often revolving around a porn star, Ron Jeremy. Then there are video games, which have grown increasingly sophisticated -- and unfortunately, increasingly raunchy and bloody -- since the musty old days of Donkey Kong and Pac-Man.More than...