Whether carnal intercourse is an integral part of this sacrament?

Objections

Objection 1 : It would seem that carnal intercourse is an integral part of marriage. For at the very institution of marriage it was declared (Gn. 2:24): "They shall be two in one flesh." Now this is not brought about save by carnal intercourse. Therefore it is an integral part of marriage.
Objection 2 : Further, that which belongs to the signification of a sacrament is necessary for the sacrament, as we have stated above (Article [2]; Question [9], Article [1]). Now carnal intercourse belongs to the signification of matrimony, as stated in the text (Sent. iv, D, 26). Therefore it is an integral part of the sacrament.
Objection 3 : Further, this sacrament is directed to the preservation of the species. But the species cannot be preserved without carnal intercourse. Therefore it is an integral part of the sacrament.
Objection 4 : Further, Matrimony is a sacrament inasmuch as it affords a remedy against concupiscence; according to the Apostle's saying (1 Cor. 7:9): "It is better to marry than to burn." But it does not afford this remedy to those who have no carnal intercourse. Therefore the same conclusion follows as before.