[tdadams]

In other words, you can't pass laws that contradict reality. The definition of marriage since prehistory is simply reality put into words. Not subject to every perversion's whims.

Your statement presupposes that gay marriage would contradict reality. That's an usupported assertion. It's also quite an ambiguous assertion. If gay marriage is codified into law and embraced by society, how is that contradicting reality? Are gay couples really just an apparition?

The value of Pi is mathematically certain. Societal norms and laws are fluid.

[PatrioticAmerican]

"Societal norms and laws are fluid." Marriage has been fluid? Since when? Name a period of civilized history where sodomy was a cause for marriage.

[longtermmemmory]

There are set standards for every society. 100% of all human societies have been Father, Mother, and baby makes three.

Homosexual marriage IS a contradiction. It is an abnormal union seeking sanction by a legal denial. No matter how you slice it (religion, science, morality, ethics) homosexual behavior is an alternative to normal sexual conduct by humans.

You can argue acceptance and tollerance, or acceptance vs. tolerance till doomsday it, but will never change physical biology.

[Publius6961]

The value of Pi is mathematically certain. Societal norms and laws are fluid.

Your choice of words is duly noted.
Marriage is not a "societal norm".
It is a shorthand alternative to "forming a family unit for the purpose of propagating the race in a more or less organized society".

That the perverts wish to redefine it has zero effect on its continuing definition.
Why can't they (and you) be satisfied by simply creating (or hijacking) a different word?
I would suggest "suicide".