I saw an episode last night. They said porn was now considered mainstream and Americans now spend as much on porn as they do on going out to the movies each year.
"This six-part, adults-only documentary series that takes an inside look at the booming, recession-proof adult-entertainment industry, estimated to generate nearly $10 billion per year."
Here's the link to the show's website:
http://www.hbo.com/docs/programs/pornucopia/index.html