After all, one of the great changes in teenagers' social environments over the past decade or so has been far greater exposure to explicit pornography, via the Internet, and violence, via videogames. Where twenty or thirty years ago teenagers had to go to some effort to see pictures of people having sex, now those things are as close as a Google query. (In fact, on the Internet it takes some small effort to avoid such pictures.) Meanwhile videogames have gotten more violent, with efforts to limit their content failing on First Amendment grounds.
But -- despite continued warnings from concerned mothers' groups -- teenagers are less violent, and they're having less sex, notwithstanding the predictions of many concerned people that such exposure would have the opposite effect. More virtual sex and violence would seem to go along with less real sex and violence.