Reference for Yevamot 110:12

אמר שמואל העראה זו נשיקה משל לאדם שמניח אצבעו על פיו אי אפשר שלא ידחוק הבשר

it was necessary [to state it, because] it might have been assumed that, as the All Merciful has made the prohibition<span class="x" onmousemove="('comment',' Of a sotah to her husband. ');">³¹</span> dependent on the objection of the husband,<span class="x" onmousemove="('comment',' The laws of the sotah apply only where such an objection or warning has been expressed. ');">³²</span> [the woman should here be forbidden] since he objected,<span class="x" onmousemove="('comment',' By his warning. ');">³³</span>

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