Reference for Niddah 6:16

ומאן דתני האי לישנא הא תניא כי האיך לישנא דאם איתא דהוה דם מעיקרא הוה אתי

neglect of marital life.<span class="x" onmousemove="('comment',' Lit., propagation'. Were it to be assumed that blood can make its way to the vagina even when the woman is unconscious of it, men would abstain from all marital intercourse in order to avoid possible complications of uncleanness. ');">¹⁴</span>

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