spot the nuptial bed:

To commit adultery . More literary than colloquial and rarely heard today. True to her sheets on the other hand is said of a faithful woman . See affair for synonyms.
See Also: beauty mark, bed, bed bugs, C-light, cloven inlet, cookie crumbs, damp patch, get one's bed, hard breathing, Irish confetti, take one's bed, tit in a wringer, transdetector, true to her sheets, wank tank, wet patch, wet spot

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