As John Noonan reads him, Thomas Aquinas is Aristotelian in everything except his sexology, in which he reverts to the rigours of the traditional Augustinianism. For the Angelic Doctor as for Augustine the marriage act is not a product of love and is not to be motivated by a desire for pleasure; it is justified only in its purpose of multiplying mankind. Noonan concedes (briefly, and reluctantly: ‘A case can be made . . he says) that late medieval theologians, Thomas included, were ‘somewhat in advance of their society in their declarations on the ideal of married love’, but, he adds and emphasizes, they failed ‘to incorporate love into the purposes of marital intercourse’. (Contraception, Mentor ed., pp. 299-311.) The purpose of this article is to summarize St Thomas’s doctrine on marriage; to show that he did indeed teach that love and marriage go together, and did also teach that love—human, passionate, pleasurable love—not only entered into the purposes of the marriage act but was also the root and source of the act’s ultimate beneficial value for the spouses.

St Thomas’s reflections on love and marriage are found scattered here and there through his vast opera, but his teaching appears in full and concentrated form in his Commentary on the Sentences of Peter Lombard, Book IV, dists. xxvi-xlii. This early teaching of St Thomas was, in the middle of the fourteenth century, incorporated into a Supplement to the Summa Theologiae by an unknown Dominican friar in an attempt to complete the Saint’s master work. Accordingly, it is these two loci that have served as the present paper’s principal sources.