Excuse me, but a diverse gender couple is NOT the same as as a duplicated gender couple.<quoted text>
A hamburger is a hamburger. A garden burger is a garden burger. These are two very different items--not even in the same ballpark.
Marriage, whether it's between same-gender or opposite gender couples, is composed of human beings. You said as much yourself when you suggested that same-gender couples should have all of the rights and benefits of marriage, but call it civil unions.
Moreover, because a redumbant gender couple is mutually sterile, they DON'T need the same rights and protections.