According to a study by the National Campaign to Prevent Teen and Unplanned Pregnancy entitled "Sex and Tech: What's Really Going On,"
21% of teen girls and 18% of teen boys have sent/ posted nude or semi-nude images of themselves.
Not to sound alarmist, but this is something that parents should be aware of, and should discuss with their children. Here are some helpful tips for parents (PDF) and guidelines for teens (PDF) from the National Campaign.
You can read a summary of the full study here (PDF).
