What simplifications of asexuality are acceptable… in a work of fiction?
In the last fictional representation of asexuality I saw, asexuality was explained as meaning that the character didn’t want sex. That’s acceptable to me, as long as it’s still framed as an orientation.
Really, I don’t expect fiction to explain asexuality at all, since I’m looking towards the utopian future where everybody just already understands what it means, or else they look it up. On reflection, I would have higher standards if it appears on popular television or a movie, because I think that calls for a more realistic assessment of the level of public knowledge.