Commentary for Avodah Zarah 45:8
ה"נ לימא משום הנאה פורתא לא מפסיד טובא התם יצרו תוקפו
Let us then say likewise that for the sake of a little enjoyment one would not risk so big a loss! In that instance his inclination impels him.
Daf Shevui to Avodah Zarah
But the same could be said about bestiality. The non-Jew would know that if he has sex with the animal (and gets caught) he could not sell it to the Jew. Therefore, he would not risk the financial loss. The answer is that while he knows this, his inclination could overcome him and he would engage in sex with the animal. Therefore, R. Eliezer is concerned about bestiality.
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