If porn is truely not the issue, Try the recommended dosage and see if works, which again if you have no PIED, and actually have clinical ED, then it should work, that's what the pills are designed to treat
Depends on your degree of PIED. Honestly, I definitely suffer from PIED symptoms (desensitization, DE/no orgasm, lack of turn on from normal sex etc) however, the pill has helped me get and maintain an eeecrion when I needed to. Didn't help with the other PIED symptoms tho of course.. so it depends on the person and degree of PIED
Honestly, I only take them (albeit much smaller dosages than full 20mg pill) for the first few times with new partners. It helped with the performance anxiety which I developed as a result of PIED. I physically do not need the pill but I find that it serves as a confidence booster because i don't have to worry about whether or not I will be able to get erect. That said, since im using it mainly for psychological reasons, it's possible to get psychologically dependent on it (the same way your brain rewires from porn usage) so I always try to ween off of it after the first few successful attempts
If you're horny then you don't have PIED right? Probably a physical issue if you're horny without a boner