Whether carnal intercourse after consent expressed in words of the future makes a marriage?

Objections

Objection 1 : It would seem that carnal intercourse after consent expressed in words of the future makes a marriage. For consent by deed is greater than consent by word. But he who has carnal intercourse consents by deed to the promise he has previously made. Therefore it would seem that much more does this make a marriage than if he were to consent to mere words referring to the present.
Objection 2 : Further, not only explicit but also interpretive consent makes a marriage. Now there can be no better interpretation of consent than carnal intercourse. Therefore marriage is completed thereby.
Objection 3 : Further, all carnal union outside marriage is a sin. But the woman, seemingly, does not sin by admitting her betrothed to carnal intercourse. Therefore it makes a marriage.
Objection 4 : Further, "Sin is not forgiven unless restitution be made," as Augustine says (Ep. cliii ad Macedon.). Now a man cannot reinstate a woman whom he has violated under the pretense of marriage unless he marry her. Therefore it would seem that even if, after his carnal intercourse, he happen to contract with another by words of the present tense, he is bound to return to the first; and this would not be the case unless he were married to her. Therefore carnal intercourse after consent referring to the future makes a marriage.