In the 1950s United Airlines had "men-only" flights between New York and Chicago. Manly cities, you see. The flights had everything the 1950s man could want; steak dinners, closing stock market numbers as you board, a pipe and slippers, and a card table in the dedicated in-flight lounge.
I remember seeing this ad in the wonderful San Francisco Airport museum and wondering how long the service lasted and what prompted its demise. God help an airline if they tried to implement something like this today.