I am curious to know how old is the practice of a woman accompanying another woman to the ladies restroom.
I assume that this practice began in America and Europe when indoor plumbing and indoor restrooms became a standard accommodation within restaurants, bars, and social clubs, which would be about the mid-19th century.
Yet, I wonder if this particular practice predates this time period not only in America and Europe but in all other parts of the world? For example, were women accompanying other women to outhouses/public restrooms going all the way back to Roman times?