I was discussing this with Medium writer Elle Beau several weeks ago under one of her articles. We agreed that queer couples (or polycules) are sort of forced to communicate well with each. We don't have strict scripts to fall back on. Our relationships don't have centuries of traditions that may or may not be healthy for us.

So we have to talk about it. We have to mindfully create our own traditions and rules.

For many of us, that means setting up a necessary climate for healthy partnership.

I'm no sociologist, so I won't make a bold causal claim. Human relationships are complicated. But I bet that the need to draw our own maps plays a role is the data you cite.