It turns out teens like sex. Who knew? So when they all got hold of mobile phones and Snapchat, guess what happened?
But as a parent, guardian, teacher or adult, or even as just a fellow mixed-up teen, it's probably your responsibility to learn about sexting, figure out why people do it - and learn to cope.
Here's a guide courtesy of HealthTV about why people sext - and what, if anything, you can do about it.