Commentary for Sanhedrin 146:1

משום דהאי לאו אורחיה הוא והא קא פגים לה אבל שאר עריות דאורחייהו ולא נפיש פיגמייהו אימא לא כתב רחמנא חטא

I would think that it is because the one is unnatural, and the other is deprived of her virginity; but other consanguineous relations, cohabitation with whom is both natural and does not inflict a great loss,<span class="x" onmousemove="('comment',' For if they are unbetrothed, there is no arus (a betrothed husband) in whom the loss of virginity will rankle deeply; whilst if they are married, her virginity has already gone. ');">¹</span>

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