That this subject is even here to discuss.  Long live FKK.

This FKK sounds wonderful. Are they only in Germany? I visited a club in Helsinki called SOHO. Lots of girls to choose from but they did not offer rooms. Also this reminds me of Rio and their termas. Similar concept I guess.
Are there FKK in Switzerland or Denmark? Visiting them soon.

You might look into joining and organized tour which includes your hotel and transportation to the clubs. The above post did not mention costs for public transportation or taxi. Tours and guides have been going on since the early 1990. They obviously know something we don't know. I know for a fact that they run specials where a day costs about 100 Euros and that includes hotel, airport pick up and transportation. This works better for those who don't want to mess with rental cars, directions, the language and hotel. You pay in US dollars so no loss in currency exchange. You'll visit clubs with other US or English speaking guys, usually doctors, lawyers or professionals. Door to door service to the most popular clubs. Sign up for the specials, the one draw back is they only run about 4-6 trips a year. They also offer personal service all year around for 1-2 people to visit one club. This might be an option instead of expensive taxi fare. For example going to World from Frankfurt is an expensive taxi ride and using their service might be cheaper.