During my most recent trips to Frankfurt, I have really started to like the scene and some of the girls at FKK-World as well. I've had some very good sucess there over the years. It is not so friendly to reach via public transport, but certainly can be reached by train and taxi if you research it and are patient and persistent. If I was there for several days, I would certainly look into it.
Another thing that I've depended on for truly successfull multi-day FKK jaunts is use of Cialis. However, it may vary from guy to guy, but I firmly believe that most men who use it for recreational purposes (like us) completely over-dose and thus loose sensitivity and cumming power. I've experimented and found that just a small sliver, say a tiny tiny chunk out of a full 20mg pill gets me over the impediments that might arrise on Day 2 or 3 or 4 of a long FKK stint. I take the smallest chunk usually on afternoon of Day 3 and it gets me very happy results. Better to start small and then up-dose with another small piece if you must. It may only be psycological but it works! I never leave home without it!
Soulmate