Work permits are required for non-EU citizens.
[QUOTE=Eeyore;1510550]I've met women working at FKKs from all of these countries, not to mention those from other places outside the EU. Would an American woman on a tourist visa face any greater risk?[/QUOTE]Those non-EU women either have a work permit or are working there illegally! American women will need a visa with a working permit as well. A couple of years ago, there was a raid at a Spermagames-party when Emma Starr was supposed to party there. She didn't have a work permit, so the party had to happen without her.