GeekKitten has pointed out to me that the German brothel story (original) has been referenced on Urban Legends. Like her, I think the 'undetermined' comment which is on the page as of 31st Jan seems a reasonable conclusion. Nevertheless, I want a definitive answer on the situation. If the story is wrong, I want to know it. If it's correct, then I want to know that too. I look forward to any reply I get.
Update: The reply has been received.