Sex and power
I can’t remember the origin, but I read someone say once that one theory for sexual attraction is that it is very often produced by an unresolved power dynamic. Sex and its sub/dom elements, along with receiving or inducing pleasure, is seen as a ‘resolution’ of this power dynamic. So once people are dating for a long time—particularly married because that’s when you ‘have’ somebody—and don’t question where they stand with one another, it’s no longer sexy or exhilarating.
Having an unresolved power dynamic just sounds like misery to me. Butterflies are just a physical symptom of anxiety. Why would I want to challenge someone to a “wrestling match” (as another user on this sub put it) when I could talk to them, or avoid them for someone who is more consistency and less mystery, someone who I can better relate to?
It makes no sense.