Reference for Nedarim 181:7

קסבר רב המנונא הכא נמי היא גופה אמרה נהי דבביאה ידע ביורה כחץ מי ידע ומשום הכי משקרא

But let 'HEAVEN IS BETWEEN US,' as ruled by the later Mishnah, refute R. Hamnuna's view, for here she knows that her husband knows,<span class="x" onmousemove="('comment',' Whether the charge is true or not. ');">¹¹</span> yet it is taught that she is not believed? — R. Hamnuna maintains that here too she would argue to herself, 'Granted that he knows that cohabitation has taken place, does he know whether the emission is forceful'?<span class="x" onmousemove="('comment',' Surely not, for only the woman can feel that. ');">¹²</span>

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