Paul is very crafty. He is not writing about physical marriage and remarriage in this passage because he does not actually use a word for marriage but rather, (and this is where the Torah comes in), he says, "so that you may
become another". The reason why he says
become another is because the two indeed become one flesh according to the Torah, (that is, Messiah dwelling in you). Though it may appear on the surface it is not the Torah which must die but us, (that is, "the flesh" with all its attributes of the old man nature). Thus again Paul speaks of much higher things than simply speaking of physical adultery which he merely uses for example and illustrative purposes. What follows in the passage makes this pretty clear; for there are two forms of Torah, and although Horeb and Sinai generally speak of the same mountain they do not speak of the same things. Horeb is Torah of Elohim, and of the mind, and of above; Sinai is the Torah of sin, (to be employed against the deeds of the body to "mortify the flesh" with all its deeds and attributes), and Torah of Sinai, which is Torah of sin and death, is of below, that is, against the old man, the carnal man, his mindset, and the deeds of the body. This is precisely what Paul states at the close of the passage, (Rom 7:25, "So then with the mind I myself serve the Torah of Elohim, [Horeb] but with the flesh the Torah of sin", [Sinai]). It truly speaks of mortifying or putting to death your "members which are upon the earth", (Col 3:5), and mortifying or putting to death "the deeds of the body", (Rom 8:13).
Romans 7:3-4 W/H
3 αρα ουν ζωντος του ανδρος μοιχαλις χρηματισει εαν γενηται ανδρι ετερω εαν δε αποθανη ο ανηρ ελευθερα εστιν απο του νομου του μη ειναι αυτην μοιχαλιδα γενομενην ανδρι ετερω
3 So then, while the husband lives, if she be becomes another man, [γενηται ανδρι ετερω] she shall be called an adulteress: but if the husband die, she is free from the law, so that she is no adulteress, though she become another man [γενομενην ανδρι ετερω].
4 ωστε αδελφοι μου και υμεις εθανατωθητε τω νομω δια του σωματος του χριστου εις το γενεσθαι υμας ετερω τω εκ νεκρων εγερθεντι ινα καρποφορησωμεν τω θεω
4 Wherefore, my brethren, you also were [have been - are being] put to death by the law, by way of the body of Messiah, toward your becoming another that is awakened-raised from the dead; so that that we might bring forth fruit unto Elohim.
The old man
soul is what must die so that we may be raised anew in Messiah, that is, by way of his Testimony, "putting on the mind of Messiah", which is truly the new interpretation of the Torah by the full Testimony of Yeshua; the transformation of the Torah from technical statutes and physical minded ordinances into Torah of Spirit and of the mind, (even the mind of Elohim), and that Testimony Yeshua paid for with his own blood, (the purchase price as you no doubt know). And yet his Testimony was not his own but given him from the Father above. There is therefore no other name under the heavens having been given among men whereby we must be saved because the Father has sealed and approved the name of Yeshua Messiah and his all-important Testimony. Those in the other thread who might be claiming to be Torah scholars are most likely speaking from the old man
soulish interpretation of the Torah, (especially anyone who rejects the Testimony of Yeshua as being that of Messiah). IMO none of this really has anything to do with the laws for men and women concerning physical adultery which is clearly morally wrong.