I think it's good for porn sites to all "have" to use the .xxx; this will make it easier for parents to filter and monitor their kids activities.
I don't however like different endings to sites. If it's not a .com I'm less likely to remember it.
.net, .ca, .org,
I actually do like .edu though because if I reference it in one of my papers, it makes it seem more credible than a simple .com
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