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"…However, due to considerations of ceremonial cleanliness, it was eventually necessary for Mary, a consecrated “virgin of the Lord,” to have a guardian or protector who would respect her vow of virginity. Thus, according to the
Protoevangelium, Joseph, an elderly widower who already had children, was chosen to be her spouse. (This would also explain why Joseph was apparently dead by the time of Jesus’ adult ministry, since he does not appear during it in the gospels, and since Mary is entrusted to John, rather than to her husband Joseph, at the crucifixion).
According to the
Protoevangelium, Joseph was required to regard Mary’s vow of virginity with the utmost respect. The gravity of his responsibility as the guardian of a virgin was indicated by the fact that, when she was discovered to be with child, he had to answer to the Temple authorities, who thought him guilty of defiling a virgin of the Lord. Mary was also accused of having forsaken the Lord by breaking her vow. Keeping this in mind, it is an incredible insult to the Blessed Virgin to say that she broke her vow by bearing children other than her Lord and God, who was conceived through the power of the Holy Spirit.
The perpetual virginity of Mary has always been reconciled with the biblical references to Christ’s brethren through a proper understanding of the meaning of the term “brethren.” The understanding that the brethren of the Lord were Jesus’ stepbrothers (children of Joseph) rather than half-brothers (children of Mary) was the most common one until the time of Jerome (fourth century). It was Jerome who introduced the possibility that Christ’s brethren were actually his cousins, since in Jewish idiom cousins were also referred to as “brethren.” The Catholic Church allows the faithful to hold either view, since both are compatible with the reality of Mary’s perpetual virginity.
Today most Protestants are unaware of these early beliefs regarding Mary’s virginity and the proper interpretation of “the brethren of the Lord.” And yet, the Protestant Reformers themselves—Martin Luther, John Calvin, and Ulrich Zwingli—honored the perpetual virginity of Mary and recognized it as the teaching of the Bible, as have other, more modern Protestants.
catholic.com/library/Mary_Ever_Virgin.asp
