You know how impotence makes a man utterly worthless*? What makes a woman utterly worthless? Is it age, lack of beauty, barrenness?

*By impotent, I mean powerlessness in general, which could mean physical, economical, or social (or sexual) powerlessness. A guy could be physically weak, but if he's not smooth or doesn't at least have money then it might be time to put him down. He at least has to provide something.