Porn hits wireless, but where are the profits?

The dirty little secret behind many new technologies is porn. From cinematography to video cassettes and the Internet, pornography has been a key driver of growth. Now, porn is showing up on mobile phones and it's relentlessly wearing down the wireless carrier's bandwidth.

In Japan, where third-generation wireless networks are more pervasive than in the U.S., buffet-style wireless internet access (all you can eat) is causing demand for porn to surge , while putting pressure on margins and on the networks themselves.