If it is voluntary it is a pointless waste of time. Stop wasting resources on it. Why isn't there a 30 second review group set up to validate this nonsense before it balloons to a boondoggle?
"Hey, Bob, can we force adult websites into a .xxx domain?"
"Nope, couldn't be done easily, cheaply, and it can be circumvented with little effort given existing technology, Ted."
"Hmmmm, okay, forget it then."
There I could have saved everyone a lot of time, money, and energy years ago!