This is a really old thread, but I was searching the archives for something else and ame upon this. Further up this thread people were wondering WHY it is important that Mary was and remained a virgin. It was posited that it was related to the Church’s hang-ups about sex. As usual the Catechism sums it up nicely:
503 Mary’s virginity manifests God’s absolute initiative in the Incarnation. Jesus has only God as Father. "He was never estranged from the Father because of the human nature which he assumed. . . He is naturally Son of the Father as to his divinity and naturally son of his mother as to his humanity, but properly Son of the Father in both natures."161
504 Jesus is conceived by the Holy Spirit in the Virgin Mary’s womb because he is the New Adam, who inaugurates the new creation: "The first man was from the earth, a man of dust; the second man is from heaven."162 From his conception, Christ’s humanity is filled with the Holy Spirit, for God "gives him the Spirit without measure."163 From “his fullness” as the head of redeemed humanity "we have all received, grace upon grace."164
505 By his virginal conception, Jesus, the New Adam, ushers in
the new birth of children adopted in the Holy Spirit through faith. "How can this be?"165 Participation in the divine life arises “not of blood nor of the will of the flesh nor of the will of man, but of God”.166 The acceptance of this life is virginal because it is entirely the Spirit’s gift to man. The spousal character of the human vocation in relation to God167 is fulfilled perfectly in Mary’s virginal motherhood.
506 Mary is a virgin because her virginity is
the sign of her faith “unadulterated by any doubt”, and of her undivided gift of herself to God’s will.168 It is her faith that enables her to become the mother of the Savior: "Mary is more blessed because she embraces faith in Christ than because she conceives the flesh of Christ."169
507 At once virgin and mother, Mary is the symbol and the most perfect realization of the Church: "the Church indeed. . . by receiving the word of God in faith becomes herself a mother. By preaching and Baptism she brings forth sons, who are conceived by the Holy Spirit and born of God, to a new and immortal life. She herself is a virgin, who keeps in its entirety and purity the faith she pledged to her spouse."170