The sad reality is that exposure to pornography is now nearly universal, even among Christian teens. As young boys develop, they are intensely curious about what a naked woman looks like. When all it takes are two clicks of the mouse, there are few boys who will resist. After experiencing a tremendous rush, they are inevitably drawn back, time and time again. And once they've seen a naked woman, they wonder, "What does sex look like?" and graduate from pictures to videos.

Pornographers who exploit the web keep inventing new ways for teens to access sexually explicit material, often in ways that parents find nearly impossible to monitor. For instance, file sharing, if erased after viewing, leaves no trace, and none of the most popular filters catch or report file sharing. When we eventually learn to monitor this, you can count on pornographers finding other ways—for instance, downloading video onto iPods and cell phones.

Parents need to be made aware of the latest "threshold" on the ...