In general I agree with what has been said. But, there are also cultural issues involved here. Some cultures smile more some less. Canadians for example smile a

In general I agree with what has been said. But, there are also cultural issues involved here. Some cultures smile more some less. Canadians for example smile a bit less than Americans, but I believe have less divorces. Also some horribly stupid smiles have to be filtered out. Some other thoughts: Recall some crazy sadistic couples, who mutilated people, killed for no reason etc. - it looks like the have pretty strong marriages,but I doubt they smile a lot.