Problem is, when you draw the definition that low, anyone can qualify.<quoted text>
Those who are fighting for same-gender marriage recognition have drawn the line at just that. To my knowledge, no major group in the LGBT community is promoting plural marriage. And I'm 100% certain that no one is promoting incest.
That is where we in the LGBT community are drawing the line.
You pretend that isn't important, but only one thing is important to you.