Luis, it is impolite to answer a question with a question. But I understand your reticence to engage in debate here. You either have to extend marriage to all who are exercising their "transcendent liberty" or you have to draw lines and regulate.
I am clear where I draw the line, you evidently do not have the wherewithal to draw a line.
Why would that be?
We are talking about one adult making the choice to marry another adult.
The only thing you lack however, is the chalk to draw that line with.
The US Constitution guarantees that even those who you would leave on the other side of your "line" get a voice.
The mistake lies in the very fact that there is government involvement in marriage to start.