Thorough discussions on FKK's are found on alternate boards such as the ISG, and are well reviewed.  There are currently NO FKK's here in the US.

The scene is predominantly in Germany with an occasional star in Belgium, the Netherlands and a couple in Austria.

Best P4P scene in the world IMHO.

Google OASE, Frankfurt Palace, Artemis in Berlin, Bernd's, Samya, Goldentime in Bruggen, etc and have the time of your life.