Some years back, Virginia passed a gay marriage law that didn't just ban gay marriage - it banned any contracts or agreements between same-sex couples that were intended to confer the "privileges and obligations of marriage." The problem with that is that the law seems to ban the inter se agreements that gay couples rely on, like medical power of attorney and child custody agreements, and that straight people also have the right to make.
For instance, a straight woman could designate her sister or her best friend as her medical proxy. but the law suggests that if a gay woman designated her partner, their agreement might not be recognized.
I'm not sure how strictly the law her been interpreted in the years since, but I know that some good friends of mine, a highly educated lesbian couple, were so alarmed that they reluctantly packed up and moved to Maryland. Virginia had always been there home and there were real tears on moving day. What a loss to the state of Virginia!