20 I now direct the attack against the passage in which, wishing to show your cleverness, you institute a comparison between virginity and marriage. I could not forbear smiling, and I thought of the proverb, did you ever see a camel dance? “Are virgins better,” you ask, “than Abraham, Isaac, and Jacob, who were married men? Are not infants daily fashioned by the hands of God in the wombs of their mothers? And if so, are we bound to blush at the thought of Mary having a husband after she was delivered?
If they find any disgrace in this, they ought not consistently even to believe that God was born of the Virgin by natural delivery. For according to them there is more dishonour in a virgin giving birth to God by the organs of generation, than in a virgin being joined to her own husband after she has been delivered.” Add, if you like, Helvidius, the other humiliations of nature, the womb for nine months growing larger, the sickness, the delivery, the blood, the swaddling-clothes.
Picture to yourself the infant in the enveloping membranes. Introduce into your picture the hard manger, the wailing of the infant, the circumcision on the eighth day, the time of purification, so that he may be proved to be unclean. We do not blush, we are not put to silence. The greater the humiliations He endured for me, the more I owe Him. And when you have given every detail, you will be able to produce nothing more shameful than the cross, which we confess, in which we believe, and by which we triumph over our enemies.
Source: The Perpetual Virginity of Blessed Mary (New Advent)