It shows that one of five American teens have electronically transmitted nude or seminude images of themselves.

http://www.businessweek.com/ap/financialnews/D9EP6AUO0.htm

That means under American law that 20% of teens are sex offenders, child pornographers.

Or maybe, Americans (or American legislators and the piggly-wigglies that vote for them) are sexually obsessive-neurotic.