This week, a federal judge blocked a prosecutor from filing child pornography charges against three teenage girls in northeastern Pennsylvania over risque cell phone pictures they took of themselves. This respite from the bizarre “sexting” scandal allows time for a national dialogue on an issue that goes deeper than simple changes in technology. “Sexting” is short for “sex texting,” or the practice of sending racy pictures via text message. Twenty percent of teens admit to distributing nude photos of themselves, according to a recent survey.