Outraged innocenceA belated attempt to curb a pernicious form of child pornography IN HER high-school uniform, neatly brushed hair and sweet smile, the young girl represents the innocence of youth. Next she is naked, having sex and seeming to enjoy it. The manga, or comic book Puru-Mero (Jiggle-Melons), picked up at a convenience store, is meant to titillate. But although children are depicted sex