German fora like mpnet or ***:
Roemerforum.de
bordellcommunity.de
fkkguide.cyberfreehost.com
Have fun
And BTW: a john is not 'buying' prostitutes, he's renting/hiring them! Actually not even that, he's just contracting their talent for a while.
A husband is the only one buying sex!
All this BS about how bad prostitution is is brainwash hype from the prudery nazis.
One example is the myth about human trafficking and forced prostitution in Germany. Learn German and read the official reports of the German FBI (the BKA) about the subject at
http://www.bka.de/lageberichte/mh.html
or use a translation engine like babelfish.com or google languages. The charts and graphs speak for themselves:
The actual number of reported cases the last year statistics are available is 877 (trend: declining), less than 1 in 1000 if you estimate the total number of German prostitutes at 1 million. Of those actually ~20% were German women, and just abut over 55% of the pimps were foreigners, including 6 Americans.
If you generously assume that only 10% of the actual cases get reported the ballpark number is maybe 8800, still under 1% and therefore "statistically insignificant" as scientists say, and within the margin of error.
In other words the maximum odds that you'll encounter a sex-slave in a German brothel is 1 in 100. Have you enough stamina for this kind of investigation? Actually the odds are close to nil since all the major FKK clubs are sticklers for immigration/labor rules and documentation for their own interest. Of course pimping and slavery are illegal in Germany.
IMHO prostitution is highly liberating for both the men and the woman who engage in it as clients and/or providers and it should be a basic human right worldwide and could be as legal, safe and sophisticated as it is in German FKK clubs.