As long as there are kids who need loving parents and as long as same-sex parents are better than no parents then same-sex couples should deffinetly be allowed. Not only would forbidding it be discrimination, which in 2011 you would think we would have learned by now that descrimination isn't okay for some groups and not others, but would hurt childrens chances for a normal future.
Don't take my word for it, ask the hundred of children who are waiting for adoption! Ask them if they would rather stay where they are or if they would rather be adopted by a same-sex couple and then you will have your answer. Ask the kids who have to live with this decsion not the polititians who have no skin in the game.