Seems clear. Doesn’t it?
Yes, it does, but dogma is dogma.
Mary was a fallible human being who sinned (for all have sinned), and she obviously had sex with Joseph afterwards (which was not a sin.)
Her perpetual virginity is a quaint notion, but is contradicted by scripture in several places, including the one you have cited.
Tradition can never supplant scripture.
“Tradition can never supplant scripture.”
Amen.
http://www.ewtn.com/faith/teachings/maryc2.htm
Fathers of the Church
Church Fathers from at least the fourth century spoke of Mary as having remained a virgin throughout her life:
Athanasius (Alexandria, 293-373);
Epiphanius (Palestine, 315?-403);
Jerome (Stridon, present day Yugoslavia, 345?-419);
Augustine (Numidia, now Algeria, 354-430);
Cyril (Alexandria, 376-444);
and others.
Teaching of the Universal Church
The Council of Constantinople II (553-554) twice referred to Mary as “ever-virgin.”
Protestant Reformers
The protestant reformers affirmed their belief that Mary, while remaining every-virgin, was truly the Mother of God. Here are only a few examples:
Martin Luther (1483-1546), On the Divine Motherhood of Mary, wrote:
In this work whereby she was made the Mother of God, so many and such great good things were given her that no one can grasp them. ... Not only was Mary the mother of him who is born [in Bethlehem], but of him who, before the world, was eternally born of the Father, from a Mother in time and at the same time man and God. (Weimer’s The Works of Luther, English translation by Pelikan, Concordia, St. Louis, v. 7, p. 572.)
Luther wrote on the Virginity of Mary:
It is an article of faith that Mary is Mother of the Lord and still a virgin. ... Christ, we believe, came forth from a womb left perfectly intact. (Weimer’s The Works of Luther, English translation by Pelikan, Concordia, St. Louis, v. 11, pp. 319-320; v. 6. p. 510.)
The French reformer John Calvin (1509-1564) also held that Mary was the Mother of God.
It cannot be denied that God in choosing and destining Mary to be the Mother of his Son, granted her the highest honor. ... Elizabeth called Mary Mother of the Lord, because the unity of the person in the two natures of Christ was such that she could have said that the mortal man engendered in the womb of Mary as at the same time the eternal God. (Calvini Opera, Corpus Reformatorum, Braunschweig-Berlin, 1863-1900, v. 45, p. 348, 35.)
Calvin also up held the perpetual virginity of Mary, as did the Swiss reformer, Ulrich Zwingli (1484-1531), who wrote:
I firmly believe that Mary, according to the words of the gospel as a pure Virgin brought forth for us the Son of God and in childbirth and after childbirth forever remained a pure, intact Virgin. (Zwingli Opera, Corpus Reformatorum, Berlin, 1905, v. 1, p. 424.)