This is actually not a bad idea. All it requires is a universally accepted definition of "porn".
No, it doesn't. The sites are already up and running and it is mind-bogglingly simple to find them.
These boys said they were re-enacting scenes they'd seen while viewing porn. That kind of eliminates sites akin to "Playboy" as their choice for viewing. Just start at the bottom of the barrel and work your way up. Any company that includes language on their sites such as "Keeper of Records" will be a fine start.