Maybe I'm naive but the ostensibly permanent contract of marriage is intended to guarantee a permanent relationship. I minimize the amount of worry I have to do about finding another mate or losing my current one. I've found what I want and I want to stay with it permanently.But why get married? You can literally do everything you do while married as two single people living together. I guess I just don't understand the drive to sign a contract that really has no benefits but can really fuck you over down the road.
Another way to look at it is most women I'd be interested in staying with permanently wouldn't do so unless I married them. Yeah there's great women out there who wouldn't mind a ltr without the chance of marriage, but most good women I know would have told me to shit or get off the pot years ago in my ten year relationship with my wife.