RE: Denying based on procreation.
It's not just about procreation per se, it is in the meaning of fundamental. If marriage is fundamental, then what is it about marriage that makes it so? As near as I tell, and of all the arguments I've seen in favor of SSM, I've never seen anyone argue successfully that the state has ANY interests outside of procreation. So, assuming the state is in for the kids, then we need to look at the fundamental design of humanity. inter alia
, humans, like every other species on the planet are designed to procreate. With some exceptions, all of them do it with some part of the male interacting with some part of the female. So, fundamentally, it is pressumed that men and women are observably consistent with the correct way to bond, and produce offspring. It is intrinsic to humanity, it is pressumptive that when men and women bond, they produce children. That some don't, and that some can't, is immaterial to these intrinsic chacteristics. One thing we do know. Homosexuals cannot, by virtue of their condition, procreate with each other. There is no ambiguity there.