c. 392–422 · Augustine of Hippo, Expositions on the Psalms (Enarrationes in Psalmos) 147.2
After food and drink thou liest down to sleep: in thy bed neither commit any pollution, nor go beyond the license given by the law of God: let thy marriage bed be kept chaste with thy wife: and if thou desire to beget children, yet let there not be unbridled sensuality of lust: in thy bed give honour to thy wife, for ye are both members of Christ, both made by Him, both renewed by His Blood: so doing thou praisest God, nor will thy praise be altogether silent.