That last quote of Augustine’s was the one I remembered.
And again, the typical Catholic’s reaction at the thought of Mary having sex with her lawful husband reveals what people really think about sex within marriage.
While there is no doubt that sex outside of marriage is wrong, the way celibacy and virginity are held up as standards to attain over marriage, strips off the fluff and shows what Catholic teaching really is stating.
If a women entered into marriage never intending or allowing for marital relations then i believe it would be grounds for annulment.