>>7426702Jerking off causes prolactin release. Prolactin is a strong dopamine receptor antagonist. Prolactin is the compound responsible for the refractory period in males after climax. Too much prolactin can lead to depression, apathy/loss of motivation, and other assorted symptoms of dopamine receptor antagonism/downregulation.
So no it's not just no-porn. It's no-fap and no-sex.
PS: dopamine causes sexual arousal, motivation, feelings of reward, and at higher levels/overagonism, causes mania, psychosis, and sexual deviancy.