Commentary for Avodah Zarah 72:8
אלא דאורייתא עובד כוכבים הבא על בת ישראל דמשכה בתריה אבל ישראל הבא על העובדת כוכבים לא ואתו אינהו גזור אפי' ישראל הבא על העובדת כוכבים
Rather the Torah prohibits a non-Jew from having sex with a Jewish woman since she would be drawn after him but an Israelite who has sex with a non-Jewish woman is not prohibited [by the Torah], and they decreed even against a Jew who has sex with a non-Jewish woman.
Daf Shevui to Avodah Zarah
Perhaps the Torah prohibited a Jewish woman from having sex with a non-Jewish man, for in a patriarchal society she would be drawn into his family. But Jewish men could have sex with non-Jewish women, for these women would be assimilated into Jewish society. Indeed, most Israelite men in the Bible do indeed marry foreign women. Then the later sages prohibited even Jewish men from having sex with non-Jewish women, because after all, this too can frequently lead to assimilation.
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