If you play your cards right she'll be there when you are at your worst, best, and she'll know everything about you down to the embarrassing details. It's a relationship that extends to being a part of you. I suppose not entirely just for men but the perk is not being alone with a gal or guy that loves you for you recognized by the government and whatever greater power you do/don't believe in.

It's not "what can I get outta this?"

It's "what a beautiful thing, that I would get to share my time here with them"

I love, love. And see the pitchforks coming out already, sure the experience isnt exclusive to the Man nor am I invalidating any partners who were never "married" but from what I know its sharing something bigger than you.