Mary, Ever-Virgin.

". . . How typical of our age of minimalistic faith is the conceding of a virginal conception while dispensing the believer from having to accept a virginal birth. As if the second would not be as easy for God to bring about as the first. But then why? Because in the New Covenant the fruitfulness of virginal life (consider above all the Eucharist of Jesus), a fruitfulness not toward regenerated mortality but into the life everlasting, will be a decisive feature of the new meaningfulness of body and sex."

--Hans Urs von Balthasar, Credo.