Reference for Sanhedrin 110:3

דבעי רב המנונא ישראל הבא על הבהמה בשוגג מהו תקלה וקלון בעינן והכא קלון איכא תקלה ליכא או דילמא קלון אע"פ שאין תקלה

— No. The second reason is that of stumbling block and of degradation, but the first teaches that even if there is degradation without a stumbling block, the animal is stoned, e.g., if a Jew committed bestiality in ignorance [of the fact that it is forbidden].<span class="x" onmousemove="('comment',' According to this, the 'stumbling block' refers to the degradation involved, and not to the sin. When bestiality is committed in ignorance, one has not sinned, yet he has greatly degraded himself. The superiority of this explanation lies in the fact that both reasons now refer to a Jew, instead of one referring to a Jew and one to a heathen, which is not very plausible. ');">³</span>

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