VIII. (7) Their rejection of marriage condemned.
In the seventh place follows their condemnation of marriages and their horror of begetting children: in which, as in almost all points, they agree with the Manichæans' impiety. But it is for this reason, as their own practices prove, that they detest the marriage tie, because there is no liberty for lewdness where the chastity of wedlock and of offspring is preserved.
Source: Letters (New Advent)