Wellcum

I visited Wellcum one week ago, right at the border with Italy, near Tarvisio. It's a fully fledged german-style FKK. A little extra cash got me bareback Greek with a 23 yo moldavian provider, CIA included (I know, I know, I was feeling adventurous).

Cool part: they have an integrated hotel, so going back to the room is a really short walk and you can get in and out of the sauna at leisure. You can also pay girls to join you in your room after closing time.

Make sure you ask for a non smoking room, if you plan to stay the night