Another way to think about it. Imagine a relationship, whatever that means to you... let's say two people who go on dates, do special things just for the two of them, rely on each other, etc. Very close and loving. Let's say they have sex twice a week. That's definitely a relationship, right?
What if they have sex once a week? Still a relationship? Of course.
What about twice a month? Once a month? Every couple of months? Once a year? Never?
At what point does the sex reach a threshold that's low enough that it's no longer recognizable as more than a friendship? Is there such a point?
And what about people who are asexual but not aromantic -- are they incapable of relationships?
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.