3 In support of his preference of virginity to marriage, Jerome argues that not only Mary but Joseph also remained in the virgin state (19); that, though marriage may sometimes be a holy estate, it presents great hindrances to prayer (20), and the teaching of Scripture is that the states of virginity and continency are more accordant with God's will than that of marriage (21, 22).
Source: The Perpetual Virginity of Blessed Mary (New Advent)