So in your mind, sexual orientation is based on the sex acts a person performs?
No, but more importantly it's the Court's opinion that sexual orientation is about "private intimate choices". So, polyamory qualifies.
Ah, so you think anything which involves "private intimate choices" is a sexual orientation, or at least that the US legal system defines sexual orientation that way?
I'm going to break this to you as gently as I can. If the premise of your entire position is
"polyamory and incest won't affect Obergefell because those two things aren't sexual orientations", you're fucked.
As I have said before, folks in LGBT calling themselves sexually oriented "away from hetero" when their males are using each other's anuses as artificial vaginas and their females are enjoying sex regularly with dildos is A GRAY AREA of "sexual orientation' AT BEST. So in the interest of equality, (leaning on the 14th Amendment here), if your cult gets to define a rigid "sexual orientation" based on "intimate choices" when clearly there are some closeted gray areas going on, then you CERTAINLY DON'T have a monopoly on the phrase "sexual orientation". Other people can define their gray-area kinks similarly and thus, have the same protections you got in Obergefell.
As we all know, you cannot exclude people from marriage based on their sexual orientation. But states still are allowed to. There's Judge Moore's defense in a nutshell. Just one of many we've discussed here; including (but not exhaustive I'm sure)
1. Ginsburg presiding over Obergefell months after she advertised to the world how she would vote on it...while it was pending in her Court. (Caperton v A.T. Massey Coal USSC 2009)
2. Kagan, same thing by presiding over gay weddings as Ginsburg did, as an embodiment of federal "impartiality" as Obergefell was pending to their Court.
3. That children had no representation at the Obergefell Hearing to their implicit and expressed (Obergefell USSC 2015) unique and thousands-years-old established share in the marriage contract & its benefits (chief of which for them: BOTH a mother and father). (Infancy Doctrine & contracts & New York vs Ferber USSC 1982)
4. That just some but not other sexual orientations or "intimate choice lifestyles" may marry. (14th Amendment)