When we want something, we tell it straight to each other. There's really no spoken rules on it. Since both of us are financially independent, we both allow each other to purchase anything specially things that are for the household and for the car. We also allow (once in a while) each other to give in to some of our luxury, but this is more of me :)
Back when it was only the two of us, purchasing personal stuff was easy. Now that we have 2 kids, we became more responsible and practical. We normally think twice now before we buy anything. What we do now, whenever each one wants something and tells the other about it, we give it as a little gift for each other and usually it comes as a surprise.
Major purchases or expenditures are being planned and we normally talk about monetary sharing.
But for something that is not material in nature, action speaks louder than words ;)
my share to this week's topic on: