Just How Big a Business Is 'Adult' Internet?

The good folks at ExtremeTech took it upon themselves this week to get at one of the Internet’s crucial questions—just how big are porn sites these days? The answer? Ron Jeremy big. To study porn sites, ExtremeTech turned to the DoubleClick Ad Planner tool from Google (GOOG). It’s a useful website where you can peek at information gathered by ad-serving cookies about how much traffic a website gets, the age and income of visitors, and the amount of time people spend on a site.