Why gay marriage is wrong? (read more...)?

I have to write an argumentative essay for my 101 cl, and we are suppose to take a side many people will disagree with, so im doing mine on why gay marriage should not* be legalized. So i want to know some logical facts, or websites if anyone know of any, on why it is wrong, shouldnt be legal, whatev, because it is pretty hard to find credible information on. and some peoples opinions on why you believe it is wrong. (id rather have the logical facts or websites over opinions but) Im not saying im against gay marriage (im not saying where i stand on this), so no mean comments toward me, please and thanks.