You just need the uber-hot actress/actor clause in your relationships. Basically, it allows an out which either of you can pursue if a possible relationship hottie comes along like KK. No ordinary women/men allowed for it. Only reasonably famous people included, no C or D list actors. No one night stands or flings. It provides stability in your current relationship while allowing the out should you actually meet and have a possible future w/someone such as KK, Jessica Alba, etc. or your girl finds and can stand Matt Damon, Josh Hartnett, etc. Fair to both but, given the odds, you'll never had to invoke it on other side of the argument.