V. Continence is required even in sub-deacons.
For although they who are not within the ranks of the clergy are free to take pleasure in the companionship of wedlock and the procreation of children, yet for the exhibiting of the purity of complete continence, even sub-deacons are not allowed carnal marriage: that “both those that have, may be as though they had not,” and those who have not, may remain single. But if in this order, which is the fourth from the Head, this is worthy to be observed, how much more is it to be kept in the first, or second, or third, lest any one be reckoned fit for either the deacon's duties or the presbyter's honourable position, or the bishop's pre-eminence, who is discovered not yet to have bridled his uxorious desires.
Source: Letters (New Advent)