Wiskers, you said above that if you divorce reproduction from marriage, it makes it possible to agree to anything.  You said that men and women can have "natural" children to cement their bond, while same-sex couples can't.  So would you suggest that couples who don't want any children, or couples who go into marriage knowing that they don't possess functional reproductive organs should not get married?  What if couples simply fail to produce offspring?  Is their marriage bond weaker?  How about couples who adopt--that's not "natural," it's a way around the natural reproductive process.  Is the non-biological child preventing a deeper bond in the marriage?  How about when one person has been married before and has kids, but the other hasn't, and they don't end up having kids together?  Or how about the elderly, long past their reproductive years (and do NOT quote to me about the unusual late-life pregnancies in the Bible).

I'm not going to argue about same-sex marriage with you, we would just have to agree to disagree on that one.  But I do take issue with your reduction of the marriage bond to biological children.