There's no law that says you actually have to follow through with the ceremony.
Make sure she stays free all the time in case you call. You're looking to settle down in a country home with that one special girl. She'll figure out the more ridiculous ones eventually but if you play this right you'll get laid first and have her captured.
If you can't think up your own, buy one of those books with Fabio (the guy from the "I can't believe it's not butter" commercials) on the cover and be one of those guys.
(God, this guy can't tell butter from margarine and chicks swoon over him?
In addition, if you buy her a fancy schmancy dinner at some ritzy place, she won't be able to turn down your request for a 0 "loan" until you can "get to the cash machine." Good investment. Girls do this stare at the phone thing, makes them all anticipatory. Call her in a couple of days or if you get horny again.
Also, after sex, just roll over and go to sleep, even if she hasn't had an orgasm yet.