MSNBC blandly claims that children decrease the quality of "marital satisfaction."
Admittedly, one researcher notes, there are different kinds of happiness: "Children don't ruin everything, Stanley points out. 'There are different types of happiness in life and that while some luster may be off marital happiness for at least a time during this period of life, there is a whole dimension of family happiness and contentment based on the family that couples are building,' he said. " Well, duh. But I will not mock too roundly this one little piece of light in what is, for the most part, a dark piece.
Elizabeth Foss has a beautiful reply to the snippet/article, which simply begs some sort of interpretation. Read and ponder.
UPDATE: And I love the First Things comment: "Sure. If by “marital quality” one means selfishness, self-centeredness, or egoism."