The legend that on leap year day (February 29) a man was obligated to accept a woman's proposal of marriage dates back many generations. At Western, the tradition translated into Leap Year Dances and teas, to which women students invited the young men of their choice. The introduction of Sadie Hawkins Day, inspired by the comic strip "L'il Abner," gave a new and lively twist to this female prerogative.
Niedermeier, Lynn E., "Speak Up: It's Leap Year!" (2007). WKU History. Paper 9.