Clearer thinking / Reduced 'brain fog' - Normalized acetylcholine levels
Pornography viewing has been shown to lower acetylcholine levels, a neurotransmitter vital for cognitive functioning. When cholinergic signaling is reduced, a subjective sense of 'brain fog' results.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4600144/
Reduced sexual dysfunction - Dopamine receptor upregulation
The mesolimbic pathway of the central nervous system receives excitatory inputs from dopaminergic neurons throughout various other brain regions. Reduced dopaminergic signaling, resulting from pornography viewing, is thought to be the primary cause of pornography-induced erectile dysfunction.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5039517/
Alleviation of depressive symptoms - Regulation of multiple neurological pathways
Alterations in the functionality of many brain regions, particularly those related to the dopaminergic system, have been shown to induce hypersexual behaviour. Many of these same brain regions are thought to malfunction in the case of depressive disorders. Abstinence from pornography viewing regulates these malfunctioning pathways.
https://www.sciencedirect.com/science/article/pii/S007477421630068X
Increased confidence - Spike in testosterone levels
According to researchers from Zhejiang University, abstinence from ejaculation caused a 146 percent increase in testosterone levels on the seventh day, while testosterone levels were not significantly influenced for 6 days prior.
https://www.livestrong.com/article/246689-the-effects-of-masturbation-on-testosterone/
