Reference for Avodah Zarah 40:6
ולטעמיך הא דאמר רב יהודה מין במינו מותר להכניס כמכחול בשפופרת הא קא מסתכל אלא בעבידתיה טריד ה"נ בעבידתיה טריד
And according to your reasoning, that which Rav Judah said that in the case of animals of the same kind he may bring them to mate like putting a painting stick in the tube; surely he, too needs to look! Rather, this is not a problem because he is occupied with his work, so too here he is occupied with his work.
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