Well let's see. The county requires strong ID from both parties. A record is kept on file. Can't marry someone else. Maybe mostly to give legitimacy to children. You know who (legally) is the father and the mother. The kids would also know who the grandparents are. Helps in divorce cases. Personally, I don't like chaos and that's what we would have. I do believe it gives kids a sense of stability and security, which is of major importance to kids. I wouldn't mind 2 husbands but..... in my dreams!