Here's a list of sites that list FKK's and a few other places:
http://www.kaleus-clubindex.com/kaleu/fkk-en.php
http://www.fkk-club.com/
http://www.fkk-sauna-clubs.de/
http://redlightaddressbook.net/list.php - also has info on partytreffs, brothels and a host of other options.
http://www.kaleus-clubindex.com/kaleu/fkk-en.php
http://www.fkk-club.com/
http://www.fkk-sauna-clubs.de/
http://redlightaddressbook.net/list.php - also has info on partytreffs, brothels and a host of other options.