KiMare, you are an idiot.At its most basic essence, marriage is a cross cultural constraint on evolutionary mating behavior. That is the scientific basis.
Ss couples are a failure of mating behavior. An evolutionary anomaly that has yet to have a purpose identified.
You claim that marriage and a ss couple are equal, yet can only do so by denying every aspect of comparison except by producing a piece of paper that affirms your denial.
I have a piece of paper signed by three psychiatrists that affirms that I am capable of living on my own.
You need THAT piece of paper to go with your other one...
Procreation is neither a prerequisite for, nor a requirement of legal marriage.
Do you have a valid argument, or are you tacitly admitting that you are a moron?