Need help arguing against a gay marriage ban

[markolas]

Originally Posted by snowman

Biologically speaking - one of the primary purposes for any species (plant or animal) to exist on this earth, is to pro-create- pass on it's off spring so the species will survive. If the ability to pro-create is hindered or stopped, the species becomes endangered or extinct.

So biologically speaking - if gay marriage were sanctioned as a viable, recognized, mainstream institution, then in theory, the human species could become endangered or extinct due to the simple fact that gay marriages do not allow the human species to pro-create/pass on offspring.

So you think that if gay marriage was legalized, everyone would turn gay? I have no idea why I'm even responding to such stupidity as this.