Gay Marriage - Yes but not the way you conceive of it.

Marriage - a positive social good for protecting women and children during the period of child rearing

Marriage - never, ever, ever, on any continent, at any time or in any culture was about love or emotion.

Childbearing - usually was associated with marriage, either before, during or after.  Was encouraged as a positive social good for the support and rearing of children.  Basically supported by almost every study that has ever been done.   

Divorce and/or no marriage is almost always only results in poverty for children.