New in ABO but make it *insert non-wolf creature here*....Leopard Slugs!
(I get this is a weird one, but bear with me)
So, Leopard Slugs apparently signal their willingness to mate by producing a different scent/pheromones in their slime, then they climb high, swirl around each other, drop down suspended on a rope of slime, then entwine their male appendages, fanning them out while they mate.
Now, from an Untamed/Cultivation view, what if having a golden core is what triggers secondary genders? Perhaps it's a biological way of ensuring offspring that can cultivate cores?
Anywho, what if instead of slime trails, it's the qi or sword glares that produce the scents/pheromones?
What if they do something similar to the Leopard Slugs? Not as a way to mate, but as a mating dance? A way to test compatibility of their energy?
They could fly up on their swords, then flip upside down before twirling around each other as they lower themselves, tethered to their swords by threads of their spiritual energy that's twisting together. At a certain point their descent will stop and spiritual energy will pool below their heads before swirling together.
The more even the mix of colours, the more compatible, the more equal and balanced the pair are.
The swirl could be like an upside down vortex, or it could form something like a appropriately symbolic flower or something.
I just think the visual effect could be stunning...also kinda funny with the long loose hair and floaty robes, but what if they're spinning quickly enough that those things aren't just dangling down, but swirling around them the same as the energy vortex below them?
(just look at that image of fucking slugs and imagine your favourite cultivator pair in their place, their spiritual energy entwined instead of slug cock and tell me that wouldn't be a visually appealing image)