The Bed Defiled: Disharmony after Matrimony? Why?

Is the bed clean just because you have spread a new sheet on top of the dirty one? Is the house clean if it is not swept, but you have put up new drapes? Many couples live together in relative harmony before getting married, but as soon as they are married, all hell seems to break loose. Why is this so?
The author examines this phenomenon based on the Word of God. The simplicity of the answer may surprise you.