http://www.law.cornell.edu/uscode/18/875.html
That is the law to which you are refering. I don't think anyone in sl is or has kidnapped, ransomed, or solicited monies for ransom or threathened bodily harm, do you?
Keep in mind that magazines such as Playboy, Playgirl, Hustler, and others, pass thru the U.S. Postal system from one state to another and are delivered to homes everyday of the week that have minor children residing inside. These magazines are protected by the Fourth Amendment to our Constitution called Freedom of Speech. So far this Amendment has protected many things on the Web that are far worse then 16 and 17 year olds coming to SL and seeing cartoon characters having sex.