How about Todd Snyder's JUST IN CASE:

You oughta know by now this love of mine is real
Honey words just can't describe the way I feel
And even though we just met
I'm so glad the date is set
And years from now I would bet
We'd be together still

But just in case
Just in case
This morning I went by my lawyer's place
I didn't think you would mind
Here Honey sign this dotted line
What's yours is yours
And what is mine will always be mine
Just in case

Well you know I can't love you enough
But I also can't afford to lose half of my stuff
There's no doubt in my mind
These ties that we're about to bind
Will hold us both together any time it gets too tough

But just in case
Just in case
This morning I swung by my lawyer's place
I didn't think you would mind
Here Dumplin' sign this dotted line
What's yours is yours
And what is mine will always be mine
Just in case