I had an opportunity to spend a few hours visiting this venerable private club in DC. They began admitting women only in 1988 [members were driven to it by law], after over 100 years of being "men-only", greatly enhancing the quality of the membership profile !!!!
Wonderful history, despite their long-time chauvinism. . . . . most of the Washington movers-and-shakers in government, the professions, and journalism etc. belong.
en.wikipedia.org/wiki/Cosmos_Club 