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A short story where a married couple agreed that one night in the year, they would each go out separately and not ask the other what they'd been up to. Every time the day comes around the wife dresses up and goes to bars where she flirts with men, the husband follows her in disguise... but the wife never actually sleeps with anyone (she's only there to reassure herself that she's still got her looks and charm), while the husband is happy he's not a cuckold. Neither of them ever tells the other what happens.
Ring any bells?