My two cents. Just got back from a visit to Samya in Cologne. I have been to most FKKs in Hessen and also Artemis in Berlin. The rates for FKK's (the best choice in my opinion) are pretty standard, usually 50E at the door and 50E for 30 mins in the room. The women vary between 6-7s with the odd 9. As you might expect, the 9th get a lot of traffic. Language is often a problem, although many speak English. The ladies are usually Eastern European. Rare, but not impossible, to find a German national. I usually schmooze the bartender if it's possible. Beer is free and the buffet usually pretty good by Holiday Inn standards. Some of the smaller FKK's, like Berndt's sauna, are more cozy. If you can spend some time and schmooze, they sort of adopt you. Driving, if you are going to drink, is a very bad idea. The Polizei are, well, German. Need I say more? Public transport is great, cabs are pricey though, and there is no Uber as far as I am aware. The cabs are usually Mercedes, and driving a cab is a profession there. Like anything else, trying to establish a rapport seriously affects the YMMV aspect of the experience. The 8-9 Ladies are usually too busy for this, although I am sure there are exceptions. BBBJ 's are available, but I don't partake. Covered everything is a good idea.