For thirty years now, preteens, whether alone or huddled with peers, have peered at computer screens and sought these things on the World Wide Web. In the 1990s, it was porno tapes the cool kid sneaked from her parents' closet and brought to the slumber party. In the 1980s, it was sticky magazines stolen from the newsstand or an older brother's closet. The technologies that made these things possible is part of the real world.
I can't even buy a sandwich in the "real world" without a computer's involvement in the transaction.