read through the posts here and Sharks seems to be the highly recommended spot. and Frankfurt area seems to be the recommended city.
I will be in Germany for the first time and wanted to check out the FKKs there. My job has me flying into Berlin. in berlin, I have 2 days to myself before having to work. Is it worth the 11 hour roundtrip travel (out of my 2 free days) to go to Frankfurt to go to Sharks? Or should I just go to Artemis? how much better is Sharks to Artemis?thanks 
do u have a recommendation for prague too? seems like saunaclub is the spot to go to?
In Prague I've only been to some "privats", these change location and girls so often that I have nothing to recommend really. I've heard the saunaclub is decent (although it can't compete with Germany) and it is very centrally located. I've also heard that most other clubs are overpriced, with cabaret Darling being the wordt (but beautiful girls). Darling is in the same street as the Saunaclub, just of Wenceslav square.
But yeah, back when I was there it was the privats that were the place to go. Had some decent sex there, given my complete cluelessness.