As long as .xxx remains voluntary there really is no problem in it ? if you don't want to segregate your content into a TLD that is easily blocked by ISPs and/or governmental authorities and then further regulated by ICM registry and IFFOR ;

IFFOR Policy Council and Policy Development Process PDF

Meet your new Master ... If they don't like how you do things they pull the plug on your online business ...

This might add a layer of bureaucracy at best to any website that you would develop.

If you want a "Family Safe," self censored Internet you should be able to buy such a package from your ISP. Why isn't this available? Rhetorical question ? there must be real market (ROI) in this service and they cannot sell the dead fish ...