Remember the good old days of teen movies? "Porky's"? "Fast Times at Ridgemont High"? The entire John Hughes oeuvre? In those movies, teenagers smoke, drank, cussed, chased each others' groins, and were generally boiling cauldrons of hormones, confusion and angst. Between then and now, though, something happened. Something stupid. These days, nothing gets the censors in a bigger lather than the idea of little snowflakes on screen doing exactly what your little snowflakes are doing in real life every time they get half a chance. That's what made the BBC show "Skins" so refreshing. Though it was severely edited for content and nudity by the time it made it to The Colonies, the show is still pretty good, focusing on a group of high school friends who get up to plenty of sexual and chemical high jinks both in and out of the classroom. Now the hit show has made the jump to a new American version, set in Baltimore. Though it doesn't get up to as much as the BBC version, MTV's "Skins" still pushes the envelope quite a bit — enough, anyway, that the puritan stuffed-shirts at the Parents Television Council recently sent out their "most urgent alert ever" to parents about the show, calling it "dangerous" and filled with sex, drug abuse and violence. You know: like your average American high school. Sounds like an endorsement to me.