No because it doesn't invalidate the concept as a whole. Human reproduction is sexual. "Marriage" developed as a means of regulating that.<quoted text>
Are all couples who cannot have, or choose not to have children "failures of mating behavior"?
Why can't their biological mother and father marry?How about trying to some up with something logical for a change?
For instance, can you prove that the tens of thousands of great children being raised by gay parents are better off if their parents can't legally marry?
Are you prove the tens of thousands of great children being raised in polygamous families are better off if their mother and father can't legally marry?
Prove that one and you would have a good argument, instead of this silly stuff.