J.M.J. You may have seen Radio Replies (Rockford, Illinois: Tan Books and Publishers, Inc., 1979) by the Reverends Leslie Rumble, M.S.C., and Charles Mortimer Carty. This is a collection in three volumes of various questions and answers regarding Catholic belief and practice.
From the First Volume, #775 (page 161):
"Why call Mary a virgin, seeing that she was a mother? The linking of the two terms in an insult to reason.
"The assertion that an omnipotent God is limited by the natural laws, which He Himself established, is an insult to reason. Jesus, the child of Mary, was conceived miraculously without the intervention of any human father, and was born miraculously, Mary's virginity being preserved throughout. I do not claim that any natural laws were responsible for this event. I claim that God was responsible, and the only way that you can show that the doctrine is not reasonable is by proving that there is no God, or that He would not do what Catholic doctrine asserts."