Consider the following.
Say there exists a person who watched too much porn. So much that their brain adapted to the stimulus by raising the "threshold" of what is pleasurable or not, as a result losing interest in everything - their career, hobbies, and even porn itself eventually.
Now I'm not a psychologist or a neuroscientist, that's exactly why I'm posting this here in the hopes of getting someone who does know a bit more about this subject than I do.
What exactly happens in the brain that causes this adaption, and can it be reversed? Say this person started watching porn at a young age therefore would've had an effect on the developing brain, and now this person is around 22 years old. How long would it take for their brain to readjust to normal levels after removing the stimulus and is it even doable at all?
And would they also have to stop masturbating as well, or is quitting just porn enough to trigger meaningful changes in the brain?