I'm sure she does. In Super Princess Peach at the end she punched Luigi out of the way, twrilling around with him.
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Yes!
Mario is basically the main hero for all his games trying to save princess peach, kind of like the knight in shining armor which was what Nintendo was aiming at and although its been seen in many games that Mario and peach share feelings for each other...it hasn't been established that he married princess peach nor has he ever been seen with a crown. Its possible he will marry her in the future if Nintendo decides to do so :D
in all of the games Mario always tryed to get peaches but they never actually made a game where they lived happily ever after and get married.
Mario saves peach in super Mario bros in 1985
No it will ruin series and most people that play Mario games are little kids that would most likely go eeewwwwwwww...lolz