I was watching some documentary on TV about an online porn company, and they were talking about several billion page views. It was one of the youtube knockoffs

I was watching some documentary on TV about an online porn company, and they were talking about several billion page views. It was one of the youtube knockoffs. All served up, for free. The guy said it was the best way to advertise and the site made money, i'm assuming through affiliate links. I've no idea how you serve up billions of page views (presumably with heavy photo/video content) and still make money. The conversion rates must be high. The porn side of the internet is something people rarely talk about, but they must have some sharp developers working on some really tricky scaling problems.