Are you married?
No, but I'd like to be someday
No, and I don't plan to ever get hitched
No, but it doesn't matter to me either way
If yes, why did you get married?
If no, why not?
Would marriage be a deal-breaker in your relationship?
If you are married, did things change in your relationship once it became "official"?
If so, how?
If you recommend marriage, why?