Though youth is fleeting, images sent on a cell phone or posted online may not be, especially if they’re naughty. Teenagers’ habit of distributing nude self-portraits electronically — often called “sexting” if it’s done by cell phone — has parents and school administrators worried. Some prosecutors have begun charging teens who send and receive such images with child pornography and other serious felonies. But is that the best way to handle it? “Hopefully we’ll get the message out to these kids,” says Michael McAlexander, a prosecutor in Allen County, Ind., which includes Fort Wayne.