This is, in fact, a billion dollar opportunity -- ads on porn sites are so abundant and so cheap, first person who will help sell more premium product by advertising it on porn sites will become a billionaire. Not happened yet, and most porn sites advertise, well, other porn sites. There might be a reason for that (and it's not a hidden cabal of puritans who run marketing departments of well-known brands being haters of porn. trust me, those folks will sell their souls to the devil for 10% uptick in sales).