Marriage around the world and across culture, religion and time is between man and woman.Prove societal harm from Same Sex Marriages.
Prove harm to the sanctity of matrimony.
Show imperical scientific data outlining the detriment to humanity from gay marriage.
Prove absolute consenses among all world cultures as to what traditional marriage is defined as.
Until you have something tangible to back your claims kindly take your opinions and immorally sodomize yourself with them.
I don't have to prove harm, i simply have to point out key major differences.
They are not the same, therefor they are not equal.