"A two-part approach might work if they introduced the .xxx domain first and then hit 'em with a restriction that they have to move their sites to .xxx"
I agree, but as a practical matter, can they force porn sites to move to a .xxx domain? And then there's the issue of exactly what constitutes a porn site, and whether sites that start off innocuously but later become porn sites will fall through the crack, and what if anything can be done about foreign porn sites. Short of requiring that all computers sold in America automatically block access to porn sites (with a monthly fee charged by the DOC for unblocking the computer, a service that would only be available to adults), I don't think the government can do much of anything about the availability of porn sites on the Internet.
BTW, it's time to change your tagline. Maybe you can tell people to say no to Mike DeWine by supporting Brinkman's candidacy in the OH GOP Senate primary (although I'd rather see John Kasich run).