[QUOTE=Partimer109;5435151]Not sure if the place still exists but last time I was in Frankfurt about 7 years ago I was in a building with over 100 single rooms 7 stories tall snack bar at entrance every door that was open had a girl waiting for business this building was so big it encompassed the whole street block on all 4 sides can't miss it sorry don't remember where in Frankfurt it was. On a positive note you can catch a 6 hour train to Amsterdam go to dam square 2 blocks away is the red light district and everyone speaks English in Amsterdam not like in Germany sprechen sie deutsch.[/QUOTE]That sounds like one of the brothels in the Frankfurt Red Light District (I was stationed in Hanau, 20 minutes outside of Frankfurt from 91-93). The ones in Frankfurt doesn't have windows so you have to go inside & walk around to see the women working there.
There are FKK clubs in the area that charge an admission fee that offer all kinds of amenities like food, drink, a pool, a sauna, etc. Google FKK tours for the website.