מתני׳ ואלו דברים של עובדי כוכבים אסורין ואין איסורן איסור הנאה חלב שחלבו עובד כוכבים ואין ישראל רואהו והפת והשמן שלהן רבי ובית דינו התירו השמן
גופא אמר באלי אמר אבימי נותאה משמיה דרב פיתן ושמנן יינן ובנותיהן כולן משמונה עשר דבר הן בנותיהן מאי היא אמר רב נחמן בר יצחק גזרו על בנותיהן נידות מעריסותן
The Gemara presents another opinion. And Geneiva says in the name of Rav: Gentiles’ bread, oil, wine, and daughters were all decreed upon due to the concern that Jews might participate in idol worship with gentiles as a result of intermingling with them. As, when Rav Aḥa bar Adda came from Eretz Yisrael to Babylonia he said that Rabbi Yitzḥak says: They decreed a prohibition upon their bread due to their oil. The Gemara asks: In what way is the prohibition with regard to oil stronger than the prohibition with regard to bread? That is, why does the primary concern relate to the oil of gentiles rather than their bread?
The Gemara offers a different interpretation: Rather, they issued a decree prohibiting their bread and their oil due to their wine. And they issued the decree prohibiting their wine due to the fact that this leads to familiarity, and Jews will come to marry their daughters. And they issued a decree prohibiting their daughters due to something else, idolatry. And they further issued a decree on something else due to something else, which will be explained by the Gemara.