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the difference matters:
sex-positive: you want people in general to be able to sexually express themselves freely. this should ideally include asexuality. this is not about you as an individual.
sex-favourable: you want to have sex for whatever reason.
sex-neutral: you don't really have an opinion about freedom of sexual expression. this is about people in general, not you specifically.
sex-indifferent: you don't really care if you personally have sex or not, you could take it or leave it.
sex-negative: you only want people to have a limited sexual expression.
sex-averse: you don't want to participate in sex.
positive/neutral/negative refer to your stance on how sex is treated within society.
favourable/indifferent/averse refer to how you personally feel about participating in sex.
you can be a sex-averse asexual and still be sex-positive.
there's a common misconception that aces, especially sex-averse aces, are all "anti-sex", but some parts of the ace community still hasn't learned the nuance of these terms either. i still see people call sex-favourable aces sex-positive when they mean different things.