More recently, from the NYT Best Seller "Superior Women" by Alice Adams
"As she walks across the Yard, and in and out of classrooms, walks around the Square, Megan stares at the numerous handsome men and boys, and she thinks, Why is it that no one sees how available I am? Why isn’t it clear that I don’t choose to be an ingrown virgin?
She takes to wearing more makeup, pancake and mascara, and darker lipstick, even to classes, until Lavinia tells her to stop. “Megan, it isn’t you, you look kind of scary like that, and a little cheap.” Which was very likely true."
I have seem it used in other ways (such as a woman so can't get laid but not for lack of trying), but mostly, its describes women who choose to remain virgins, e.g., a sort of voluntary spinster.