The Midwest Teen Sex Show. A comic and informative view of safe sex and sex education in a time when half the school districts in America are teaching "Abstinence Only". It's happy, it's healthy, and it's funny as hell. Got a kid between ten and fourteen? Park them in front of the computer with this link and then get the hell out of the room.
Oh, and incidentally? Not even remotely safe for work. But holy shit, this -- this is the reason the internets were invented. Go. See. Now. Er, after work.