Incubus gender rule
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In D&D lore (and probably other lore as well) a succubus can change into an incubus and vice versa. They can choose however they look and decide if they are a top or a bottom.
So they're really more like a switchubus
Bicubus
Only in d&d? :(
I looked it up for you, it's the same in Pathfinder :)