Two guys doing each other in the ass, or women munching carpet do not a family make. And do you really think a piece of paper is going to change societies views towards gays?
Your juvenile phrasing aside, you are correct to some extent. Sex alone does not a family make, whether it's a man and a woman having a one night stand or same sex tertiary couplings. However, commitment to each other for better or worse through thick and thin until death do us part DO a family make, and I defy you to tell me I'm wrong.