[Dr. Eckleburg]

It is however notable that Mary was called the Virgin since pretty much her days on earth, so we can be sure of her social virginity as a part of the Sacred Tradition. That was an observable lifestyle, at least after passing of St. Joseph

Joe Namath is still referred to as a quarterback but I don't see him perpetually suiting up on Sundays.

[annalex]

That is because to be called "quarterback" one has to do something once, while in order to be called "virgin" one has to not do something even once.