They are boy friend and girlfriend. Bowser keeps on kidnapping her because he's jealous.
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Princess peach is a princess and princesses are not boy also she would not kiss mario when he saves her and she does kiss mario so yeah peach is a girl.
I'm sure Mario does. I'm sure Mario does.......
Bowser kidnaps Princess Peach because he is Jealous of Mario,so Bowser wants to rule the Mushroom Kingdom :)
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
Mario is most likely best buddies with his brother, Luigi. He's in love with Princess Peach so I wouldn't say they're best buddies, but instead I'd call her his girl friend. The toads work for princess Peach, so I don't think they'd be Mario's Best Buddies. Maybe Yoshi, but Mario is seen with Luigi the most.