Society did not get involved in protecting marriage because married people decorated their own homes, or settled in a particular community, or attended a particular church, or engaged in a particular form of foreplay, etc., etc.. The Societal involvement--the societal recognition of marriage--from first to last, relates to the mating concept; relates to the perception that it is important to enforce contractual rights in a situation, where the well being of the next generation is involved. The Societal involvement is basically a collective desire to protect the reproducing family.
The very notion of "same sex marriage" is an oxymoron. While you can call anything, anything, that does not an argument make. You could call a man purchasing a car, a "marriage," but that would not make such a "marriage" in any sense equivalent to what rational people, using language in a rational manner, mean by the term "marriage."
When you debate with others, always go back to the original premises of the subject. Always ground your argument on what is undeniable--what is real and true and basic.
William Flax Return Of The Gods Web Site
Well done.