Marriage is an institution designed for the preservation of our society into the next generation by legally codifying the protections of a family, including the children that issue forth from a marriage relationship.
Marriage is less of a right than a codified set of responsibilies that helps preserve the family as a secure institution in society.
Those who dont want to enter in the committed man+women relationship that we call marriage lose no rights nor privileges, no more than a non-trout fisher 'loses' the 'right to fish' because he can't get a fish license in a desert.
Marriage has been watered down enough without further destruction by folks who want to pervert it into a 'right' unrelated to the core tasks of carrying civilization forward. Gay marriage in USA will destroy traditional marriage and family just as it harmed marriage and family in Scandanavia. Such a radical derogation of marriage, simply to make a subset of Americans feel more comfortable with their own lifestyles, is not worth it. Not even to the community that is demanding it.