Your source of data are teens whose parents gave you permission to ask them questions about sexting via phone?!? You are silly to think that they would all be competely honest. They are already hiding it from their parents, why would they disclose to a resource such as yours to published as public data? They aren't complete dummies.
Sexting is different only because it is happening “in an environment that the adult community doesn't understand as well as kids,” Rich said.

Completely ridiculous comment! This is something parents do not want their teens doing and yet you make it sound as if it is appropriate. Socially acceptable and developmentally appropriate are usually at odds with each other. I do not like this article nor do I care for Dr. Rich's opinion - you are the caveman you mentioned in your statement.