Reference for Yevamot 51:14

<br><br><big><strong>הדרן עלך כיצד אשת אחיו</strong></big><br><br>

it is not usual, however, for men to pay frequent visits to other men.<span class="x" onmousemove="('comment',' And suspicion that any intimate intercourse might take place would, therefore, be groundless. ');">³⁴</span> Or [this] also:<span class="x" onmousemove="('comment',' May be said in reply. ');">³⁵</span> Women who do not cause one another to be forbidden by their cohabitation<span class="x" onmousemove="('comment',' With one another's husbands. The husband is not forbidden to his wife if cohabitation occurred between him and another woman. ');">³⁶</span>

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