As you said, it was already not clear in SecondLife, and is even less in OpenSim. But what is missing really is just a bit of cleverness. I own a naturist nude beach sim on OpenSim since a few years, and from the start put it explicitely it's for nude people : on the region description, on OSW, on posts I did here and there, on signs at the landing point. Not even talking about public sex, just nudity and children access is something people are too lazy to care about. I got countless people coming to my region and asking why I am naked... People just don't read anything, they don't care about policies (on grid or region level), they don't care about anything.
So to me it's more a problem about persons than technical, by recommandations or anything, and that problem has no good issue.
Myself, I never rely on a region rating, but on information I get from its description and in doubt if I want to reach a naturist area, I arrive either in a bikini or with clothes, that I take off once I'm sure about what to do. I think people globally don't check anything.
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