It was "Coffee, Tea, or me?" in the era of wealthy executives flying first class. Attention from desirable men is desirable.
Common peons better keep their hands off. Attention from schlubs is undesirable.
The last time I flew 1st Class transpacific I had a male flight attendant lead with several mature females. The iconic stewardesses of the 60s are long gone.
However, I find the Asian Airlines (Cathay Pacific, Japan, etc) to have very sexy attendants. Plus they are very helpful.
I had to run to make an AA flight to Tokyo and was the last passenger to board, had the last Business Class seat next to the kitchen. Needed something to drink (juice, water, beer) from the run, had to wait over 30 min to be served.
Below are job requirements from an actual classified ad from the NYT in 1966 for a stewardess:
A high school graduate, single (widows and divorcees with no children considered), 20 years of age (girls 19 1/2 may apply for future consideration). 5'2" but no more than 5'9", weight 105 to 135 in proportion to height and have at least 20/40 vision without glasses
In fact, a major recruiting point for the airlines was that a young attractive woman could find herself a husband working for their airline. She could then move on, have some babies, and make room for the next young pretty woman to have her chance. The whole "coffee, tea or me" way of putting it is rather vulgar but in reality, the airlines did not discourage at all the notion of stewardesses finding themselves a husband among the passengers. Having attractive stewardesses - all of which were available - no doubt helped the airlines sell tickets and so they would vie for the prettiest young ladies to join their crews.
It was a simpler time in America, where women were encouraged to "have adventures" early on but were then expected to find a husband, have some children and spend the rest of her days as a happy housewife and mother.