It's all a big blur in my head, so who knows where I got the idea from :)
Anyway: the problem with defining gen as "no more romantic than canon" is that while it makes a certain amount of sense for most tv shows (which tend to be low on the smooches) it gets a bit silly for more explicit canon. Take something like the Anita Blake series, which from what I've heard is pretty much pure porn in ther later books. By your definition all fanfic for that series is "gen", from friendship fics to highschool AU PWPs.
Also a lot of people using that sort of definition (but not necessarily you, as I said it's all a blur!) seem to think that all slash is automatically not gen, which seems a bit odd to me for those slash stories equivalent of the sorts of romantic stories pursued in canon.
So, personally I am inclined to keep "Like canon" and "no romance/sex" as two separate things. I must admit this does leave a gap for stories which contain brief canon-level romantic references but are otherwise fairly different to canon, but your classification ignores noromo stories set in romance/sex heavy canons.
So, in conclusion, all classifications suck and I guess we tend to argue for the one that suits us best :)
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Anyway: the problem with defining gen as "no more romantic than canon" is that while it makes a certain amount of sense for most tv shows (which tend to be low on the smooches) it gets a bit silly for more explicit canon. Take something like the Anita Blake series, which from what I've heard is pretty much pure porn in ther later books. By your definition all fanfic for that series is "gen", from friendship fics to highschool AU PWPs.
Also a lot of people using that sort of definition (but not necessarily you, as I said it's all a blur!) seem to think that all slash is automatically not gen, which seems a bit odd to me for those slash stories equivalent of the sorts of romantic stories pursued in canon.
So, personally I am inclined to keep "Like canon" and "no romance/sex" as two separate things. I must admit this does leave a gap for stories which contain brief canon-level romantic references but are otherwise fairly different to canon, but your classification ignores noromo stories set in romance/sex heavy canons.
So, in conclusion, all classifications suck and I guess we tend to argue for the one that suits us best :)