God Only knows

So this Beach Boys song has been mentioned lately as a recessional for the bride and groom. Maybe if I had heaerd this song in some place other than the opening of the polygamy themed show "Big Love" I'd feel diffferently about it. It seems to me though that you wouldn't want the first words you hear after being pronounced husband and wife to be "I may not always love you" or "If you should ever leave me Well life would still go on believe me". While the next lines say that life would not be worth living without the other, it seems to almost make a joke of the vows you've just taken. Is this just me?