round heels

Promiscuous. The image is that of a woman who is such a pushover that the heels of her shoes became rounded from her being pushed over backwards so frequently. The phrase was popular in men's dormitories and barracks until the sexual revolution changed attitudes. Other obsolescent phrases and expressions were “a scarlet woman,” “a woman of easy virtue,” “loose [or “low”] morals,” a “tramp.” On the other hand, men were applauded for being a “lady's man,” a “cocksman,” a “Romeo,” or a “Casanova,” all of which demonstrate which gender controlled the language.