This is ridiculous and unjust.
First, let me tell you that I don't deal in adult domain names or websites and never have.
(Doesn't mean I haven't thought about it more than a few times.
)
That also "DOES NOT" mean that I condemn others for doing it -- so long as they aren't adulterating children and minors in their content.
Take notice that I said "in" their content. Not "with" their content (unless of course they are marketing to children and minors... but this is something else in itself).
I believe that a child's parent or guardian must take responsibility for what they view on the Internet, in their home, or anywhere else.
To penalize a business (for this reason) because a parent or guardian is neglectful is inexcusable.
It's no different than saying a site that deals in anti-abortion should be taken down and given the .abt extension because their pictures and content describing the process of abortion offends others and could affect a child's mental development.
Or no different than saying a site that deals in autopsy photos should be stripped of their .com and given a .apy because a child could accidently stumble across it while typing in random characters into their browser window.