Making the use of a .xxx domain mandatory will be a huge technical nightmare.
their entire argument for making .xxx mandatory willb e based on "making it easier to filter content".
You can undermine their argument by labeling your sites using rta/irca/safesurf metatags or header tags:
http://www.gofuckyourself.com/showth...8#post17989708
http://www.gfy.com/showthread.php?p=...8#post17989708