With such unions legally valid in 34 states and many Western countries, it appears that the slow but inexorable tide of history is in favor of legalization.
A case of a gay couple in New York who adopted a child born in Ohio demonstrates a need in one instance for an update to civil laws. The new parents are unable to acquire a proper amended birth certificate from Ohio. While their marriage is registered and proper in the State of New York, the State of Ohio on the other hand does not recognize gay marriage and as such will not effect the proper birth certificate amendment upon adoption that every other child is entitle to have. This creates a tangle of problems for that child when he gets old enough to go to school, and engage in all of the assorted civic activities that others are allowed to do.
Indeed, even his ability to act as nearest relative for a sick parent could be denied as has occurred in some cases with people bearing explicit, written power of attorney paperwork. Furthermore, the right of inheritance could be called into question, given that a parental connection is not established by way of a simple, amended civic document.
Let us be clear: same sex marriage did not cause this problem. The refusal of public officials to honor the affirmed, fundamental rights of a class of people contribute to this situation. It will take bold action by the Court to move society into the 21st Century, but we'll all get there.