This really brings back memories. Someone posted it earlier on the British Military Hospital Berlin group.
In Stuttgarter Platz in Berlin, there is a club called Mon Cherie. At various times during the evening, the stage slid back, and a clam shell bath filled with warm soapy water appeared, whereupon a couple of the women working in the place would persuade two of the male audience to undress and join them in the bath. The event was signposted by the music switching to 'Automatic Lover'.
A ward night out always went the same way, dinner, Hofbrau House then Mon Cherie. On one occasion, we persuaded the Captain in charge of the ward to go in the bath (vast amounts of alcohol always involved), somehow, his clothes disappeared. It takes cojones to wander round a packed club starkers, looking for your clothes.
On one of our trips back to Berlin, my mate and me went back to Mon Cherie, they had remodelled it and tarted it up, completely ruining it. It was empty, bar us and a portly gent who spent the entire time in the bath with two women.
From my memory box:
The bottom is serrated because the entry fee of 5DM (about £1.20) included two drinks, the drinks chits were on the bottom of the ticket.