Reference for Nedarim 182:3

ההוא גברא דהוה מהרזיק בביתא הוא ואינתתא על אתא מריה דביתא פרטיה נואף להוצא וערק אמר רבא איתתא שריא אם איתא דעבד איסורא ארכוסי הוה מירכס

A certain woman shewed displeasure with her husband. Said he to her, 'Why this change now?' She replied, 'You have never caused me so much pain through intimacy as to-day.' 'But there has been none to-day!' he exclaimed. 'If so,' she returned, [it must have been] 'the gentile naphtha sellers who were here to-day; if not you, perhaps it was one of them.' Said R. Nahman: Disregard her; she had conceived a passion for another.

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