I've seen subreddits about this sort of thing, but I don't remember the various names used.
I don't doubt that some real people might feel this way. More than a few are attractived only to drawings and feel no attraction to porn with real people, so this fictosexuality as we call it is just a short step further.
Although I can believe it's real, it can also be faked. I see potential here for some individuals to use the label as an excuse for giving into fear of intimacy and cutting out all real life connections that could become either sexual or romantic. I would even guess that people who abuse the term and lie to themselves are more common than the real thing.