This might come as a shock to you, but my parents were never married. Yes, I'm one of those 'out of wedlock' children.
Of course, they had been toghether for nine years when they had me and it lasted another four, but no marriage ever happened.
This did not stop me from being a happy, well adjusted child for the most part. Nor did it mean at any point that I didn't have two loving, caring parents, two sets of grandparents and an assortment of aunts, uncles and family friends, that all looked out for me and took care of me growing up.
It is almost as if marriage is a societal contruct, that is loosing importance or something.
Then again I'm not american.