If you are suggesting that my 20 year marriage is unnecessary and invalid because we don't have children I take offense and would yell you go straight to hell.
The happiest married couples I know don't have children.
You must not know me or my wife. We had a great marriage before children and now with children it's even better.
Like someone said above, marriage is what you make it. I can choose to go home tonight and be in a miserable mood for whatever reason or I can appreciate what I have.