If you're looking for fingers to point, neither Ubuntu nor Gentoo use ipv6 on their web servers. Several other Linux distribution web sites and forum sites appear to not have ipv6 support either. That said, I'm not sure we really need to push on that. They'll get the message sooner or later, and it also seems that most of the Linux forums are hosted on a third-party website. So the lack of ipv6 support isn't really their fault.
Last time I was on a university network, they were still arguing about whether root domains like .com would be a thing or not, and gopherspace still saw traffic. So I have no idea about ipv6 implementations there.
I don't know about partial implementations of ipv6 on porn (or any other) sites as a security mechanism. That seems like WAY more work than it's worth. IPV6 implementations and defaults are a moving target and that's not likely to change soon. Modern sites have excellent security if it's implemented correctly, no need for ipv4-vs-ipv6 anywhere, or even a real need to put more restricted documents on another site.
What I was talking about is more the idea that some hard-coded link on the site goes to an ipv4-only server, and if that link has functionality instead of just ad space then the site is broken.
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