Not reciprocating; not responding in kind(adjective)
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Use "nonreciprocating" in a sentence
"Instead, she finds herself inside the Museum of Sex, putting her new, wet umbrella inside a complimentary plastic sheath, checking her maternity jacket, and walking—without child—through exhibits archiving the history of penetration, acts left unrealized on this particular trip, aside from a nonreciprocating warmth she took down her throat, welcomed and without reflex."