▁Man ila ▁was ▁the ▁only ▁Club ▁ever ▁to ▁be ▁featured ▁in ▁Arch itect ural ▁Dig est . ▁During ▁the ▁last ▁three ▁months ▁of ▁ 1 9 6 1 , ▁more ▁than ▁ 1 3 2 , 0 0 0 ▁people ▁visited ▁the ▁Chicago ▁club , ▁making ▁it ▁the ▁bus iest ▁night ▁club ▁in ▁the ▁world . ▁Play boy ▁Club ▁membership ▁became ▁a ▁status ▁symbol . ▁Only ▁ 2 1 % ▁of ▁all ▁key ▁hold ers ▁ever ▁went ▁to ▁a ▁club . ▁At ▁$ 2 5 . 0 0 ▁per ▁year ▁per ▁membership , ▁Play boy ▁gross ed ▁$ 2 5 ▁million ▁for ▁every ▁ 1 , 0 0 0 , 0 0 0 ▁members . ▁ ▁The ▁Rab bit - head ed ▁metal ▁Play boy ▁key ▁( supp l anted ▁by ▁a ▁metal ▁key - card ▁in ▁ 1 9 6 6 ) ▁was ▁required ▁for ▁ad mission ▁to ▁a ▁club . ▁They ▁were ▁presented ▁to ▁the ▁Do or ▁Bun ny . ▁Through ▁most ▁of ▁the ▁years , ▁a ▁strict ▁dress ▁code ▁was ▁enfor ced . ▁ ▁In ▁ 1 9 6 5 , ▁Hugh ▁He f ner ▁sent ▁Victor ▁L own es ▁to ▁London ▁to ▁open ▁Play boy ' s ▁British ▁cas inos , ▁following ▁legal ization ▁of ▁g amb ling ▁in ▁the ▁United ▁Kingdom . ▁In ▁ 1 9 8 1 , ▁the ▁cas ino ▁at ▁ 4 5 ▁Park ▁Lane ▁( now ▁a ▁lux ury ▁hotel , ▁ 4 5 ▁Park ▁Lane ) ▁was ▁the ▁most ▁prof itable ▁cas ino