Figure this bears repeating.
I'm figuring that there is no law because German lawmakers didn't think of it, it's just too vile. You only bother to have laws against bad things you think someone might really do, right? You don't sit around thinking of hideous things. Maybe that's a mistake.
It happened in the USA once that I know of (Jeffery Dahmer), but he was convicted of crimes other than cannibalism. Is there a law against cannibalism as such in any state of the USA? Not arguing, only asking.
Apparently, this is a subculture in Germany, though most members of it are only fantasizers. Sick!
Obviously Germany recognized a right to privacy.