Temporarily closed.  This popular gay fetish-oriented cruise bar is in the heart of Cologne, directly behind Hotel Barceló.  This 170m2 play space is a great place to make new friends or perhaps enjoy a hot session in one of the adult play areas.  Carbon attracts omen of all ages and has a different theme every night of the week.  The club requires that you wear 'masculine' clothes.  Leather, rubber, uniforms, sportswear are welcome.  Check website for specific dress code guidelines.  U: Rudolfplatz