Mesorat%20hashas for Niddah 144:12

ומאי שנא משכב ומושב דמטמיא ליה ומאי שנא בועל דלא מטמיא ליה

why is it that she conveys uncleanness to couch and seat and does not convey uncleanness to the man who had intercourse with her? — To couch and seat which are in common use she conveys uncleanness but to the man who had intercourse, which in such circumstances is an unusual occurrence, no uncleanness is conveyed.

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