Quote:
Originally Posted by masaegu
奥さん can be used when the husband already knows well the person(s) to whom he is introducing his wife kind of jokingly in a relaxed situation.
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The reasoning behind this is an 内／外 thing, right? Your friend is in your in-group, so calling your wife 奥さん would be like how you and your coworkers call your boss 社長さん, but you would speak of your boss to a guy at another company as just 社長 with no さん.
(But as 奥 is not a word for your wife, you can't just say that.)