The likes of Netflix and Megaupload — not to mention good old-fashioned torrenting — are usually touted as some of the biggest drivers of internet traffic, but ExtremeTech took a look at another source: adult content. The site surveyed usage data pulled from Google's DoubleClick Ad Planner, and discovered that the most popular adult site on the web serves up 4.4 billion page views per month — Reddit, by comparison, clocks in with just 2.8 billion. Usage patterns stray from the norm as well: adult site visitors stay on a given site longer than your average web surfer, with video likely a much larger percentage of the content being consumed. Assuming a baseline video resolution of 480 x 200, ExtremeTech did a bit of napkin math to estimate that users of the adult site in question are on average downloading as much as 50GB of data every second. ExtremeTech was then able to obtain actual usage data from the second-largest adult side on the web; that data indicated that the Ad Planner numbers may have even be on the low side. In fact, ExtremeTech estimates that as much as 30 percent of the data transferred across the web could be tied to adult sites. While many of the calculations are rough around the edges, the findings definitely seem to indicate that as social as the web has become in the last decade, it's still home to some very private behavior.