Countess....... I beg to differ...... posted WITHOUT comment!!!
Ad for Myzone menstrual pain pills (1952)
In the ad, below, the woman couldn't explain the pain to her male boss, shadowed in the door window, because it concerned menstruation, unmentionable even today.
Note that the ad doesn't mention coffee, which it would in America, and not tea.
"My zone" is a woman's private zone and off limits to her boss, and most men, when it concerns menstruation pain. including PMS. An American douche liquid seems to have also used the same concept decades earlier (Zonite).
See old Australian ads for menstrual pads and belts.