Interesting article with an interesting quote:
"What people really hate about spam more than anything else is porn," Fallows said. "There is a special place in hell for the pornographers among all the spammers."
Personally porn spam is the least of my qualms with spam, all the mortgage, viagra, pharmacy stuff is alot more annoying and plentiful.
http://www.wired.com/news/culture/0,1284,60935,00.html
Good read, check it out.