Very interesting.
Calssification can always be helpful.
I completely agree on points 1 and 2. The both substitute you immagination and real experience with details only real sex and seeing a naked partner/person could give you. They create expectations on looks, behaviour and procedure.
On point 3 i can only partially agree. Weritten erotica still leave space for immagination and may perhaps be also an impulse making you horny and wanting to try it in real life (assuming the listed nr 1 + 2 are non existant). Since we have porn and pics and audio to get back at, erotica might only lead to them and the stirred up immagination by written erotica may also only cause ones brain to relate to pornscenes. So in general (no), under todays circumstances (YES)
points 4 and 5 are difficult. If the forum one is about sharing experiences like this one, I would not caracterize it as porn. There surely are fora with very explicite topics, which one could read to satisfy the pornographic needs. But it depends. The same is with articles. If they are educational or teach new ways that can be implemented into ones way of life without harming, I would not call them pornography. Unless the explicitely show some pornographic conctent in writing, video/audio and picture.
camming with sex: YES. Perspectives however are different because main action is between two people acting in real time and constantly debating on the rules of what they are about to do. I would say it is more like non physical sex, but still strongly correlated with voyeurism - therefore, yes!
sexting and phone sex are difficult. The set of rules is limited to voice and writing. The imput can only be prcessed if the situation is appropriate. The outcome however is the same as in pornpics or audio (but jacking off to a text message does indeed sound a bit strange to me....)
All in all the question is very difficult to answer. There is an article of Michael C. Rea, that was published in 2001 (Rea, 2001: What is Pornography, No?s, Vol. 35, No. 1 (Mar., 2001), pp. 118-145), that suggests different approaches.
-> to be found at
https://www3.nd.edu/~mrea/papers/What%20is%20Pornography.pdf
one definition on p. 132 says:
Pornography is the depiction by visual, literary, or aural means, of subject-matter
intended to be sexually stimulating, when that depiction is for the purpose of such stimulation.
1993, p. 226; emphasis in original
in his article he also depictures the difference between pornography and art/literature, which becomes blurry in an addicts case.
This indeed is a matter that should concern everybody because without a definition the limits of our "challenges" may also become blurry. Eventually of course the definition is up to oneself, since we make the rules in our lifes.
But I am very much interested in what other people think about this. A very good topic.