I am an Italian noahide.
As is known, the Torah prohibits marriage between Jews and Gentiles, and in general sexual intercourses between them. There is, except for my mistake, the exception concerning the first sexual intercourse between a Jew and a "yefat toar" (see Devarim 21 : 11-14).
In this regard Rambam states, in Mishneh Torah-Melachim uMilchamot 8:3
"This license is permitted whether the woman is a virgin or not, even if she is married, for the gentiles' marriages are not recognized."
The reference to the lawfulness of this intercourse even if the Gentile woman is married, "for the gentiles' marriages are not recognized", has left me rather perplexed, as we read in Devarim 22:22:
“If a man is found lying with a married woman, even both of them shall die the man lying with the woman and the woman. So shall you clear away the evil from Israel.”
In this passage we read "married woman", not "married Jewish woman".
I therefore ask myself: but if Rambam's statement is correct, without prejudice to the general prohibition of sex between Jews and Gentiles, does a sexual intercourse between a Jewish man and a Gentile woman married to a Gentile man not constitute adultery according to Halakhah? And if it is not adultery, how can this exegesis be reconciled with Devarim 22:22, which precisely speaks of "married woman" and not of "married Jewish woman?"