Granted, pornography can be controversial in some social circles, and granted, some pornography is disgusting and degrading. But Apple is a retailer for media content, and pornography is a form of media. Oftentimes it's locked up in Windows Media formats that can't play on a Mac. iTunes would give porn vendors a nice venue to sell their product in a protected way to both Mac and PC users. And iTunes could easily implement age-checks. You might frown on my suggestion, but do you frown on your local video rental store with the adult section in back?