Sorry I missed seeing this until now. I spent a lovely few days in Hamburg several years ago, staying in a small boutique hotel close to the train station and at the edge of a RLD. Funny thing, although it certainly wasn't planned, when I first looked out my hotel window to survey what lay below, right next door was one of the PartiTreff night clubs! These are almost-FKK clubs. Naturally I checked it out, but being somewhat sensitive to cigarette smoke I had to take a pass, it was really cloudy inside although the eye candy was superb, even viewed through the haze from the doorway.
Check out
www.modelle-hamburg.de for all you need to know. This site has been revised from the easy-read of a few years ago into a more sophisticated one, but the info is all there.
If you are a bit lacking in German language, have no fear, there are two other languages common to most in the biz - English, and sex.
In the Categories, you will find massage. There are a good number of Thai and related MPs, I tried out three and had a real massage and a bang-up time. These are just what the doctor ordered, I am claiming. Also you can find brothels of various sizes and styles, plus indys of all types. AVOID the main RLD area downtown except for sight-seeing.
There are a few FKK and similar establishments in the immediate area.
Enjoy the public transportation system featuring no ticket booths on the subway!