The ultimate test of functional maturity in a person is to be able to sire a young one to continue not only their lineage but also to further the existence of their species and race. Continuity seems to be the ultimate reason why we all exist. Isn't it interesting that among humans marriage is treated with so much regard?
A marriage that does not produce babies is frowned upon and arguably treated as a failure with points of failure being sought from both within and without. If the fault is with the woman, the man will be encouraged to find another wife. If the man is the one unable to sire, the woman will be pushed by society to find an alternative man to help her finish her purpose to mother nature.