Did you know that "1 in 5" statistic reports will have the "1 in 5" statistic? It's true. See here for more on the "1 in 5" which is seen all the time in so-called studies.
You can also listen to John Walsh talk on Internet safety, sexting, etc. Also see the study here (PDF). You will notice, the study doesn't say anything about "1 in 5," so did he just make it up on the spot? Probably! Educating people is good, and should be done, but making up false information to do so, that is not good!
People, as they get older, get more ignorant. Think back to your childhood. How many things did you do that were dangerous? I am willing to bet, a lot. And apparently, the kids in the audio above, are just saying what others want to hear. I am willing to bet, they don't practice what they preach.
Also, why give your kid a cell phone with all the works? All they need is a basic phone they can use in case of emergency, then sexting would not be an issue. Cell phones are distracting them, keeping them from learning. Give them a phone with basic phone capabilities only, when they are able to drive, or 18, then they can get the rest of the capabilities. If parents did that, then this would not be an issue, now would it. And I notice John didn't mention that at all. Why not?