Reference for Sanhedrin 109:6

המערה בזכור (ויקרא יח, כב) משכבי אשה כתיב ביה אלא המערה בבהמה מהו

But [the question to be asked is] what if one commits the first stage of bestiality? — He replied: Since the culpability of the first stage of incest, which is explicitly stated with reference to one's paternal or maternal aunt, is redundant there, for it is likened to the first stage of intercourse with a niddah,<span class="x" onmousemove="('comment',' Niddah, a woman during her menstruation. ');">⁶</span>

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