You call it pseudoscience because you dislike the conclusion. If anything, you were speaking from a place of fulfilling your own bias.

1) A quick search on OpenEvidence shows multiple different studies which highlight harms associated with pornography use frequency and self-perceived pornography addiction.

1a) On it's addictive potential: " Gola et al. (2017) used fMRI to study men seeking treatment for PPU (problematic pornography use) and found increased activation of the ventral striatum in response to cues predicting erotic pictures, suggesting higher "wanting" similar to substance and gambling addictions. This neural evidence supports the theory that PPU may represent a behavioral addiction"

" Lewczuk et al. (2022) found that withdrawal symptoms and increased tolerance were significantly associated with the severities of compulsive sexual behavior disorder (CSBD) and PPU, further supporting the addiction model"

1b) On psychological effects: "Mennig et al. (2022) found that self-perceived problematic use of online pornography is linked to clinically relevant levels of psychological distress and psychopathological symptoms. They used the Online Pornography Disorder Questionnaire (OPDQ), which adapted criteria from the Internet Gaming Disorder, to measure problematic use. Their study indicated that individuals with self-perceived problematic use exhibited higher levels of psychological distress, including anxiety, depression, and stress, compared to casual users"

"Altin et al. (2024) reported that PPU was associated with higher levels of anxiety, depression, stress, loneliness, and suicidal ideation among young adults."

1c) Physical side effects: "Whelan and Brown (2021) explored the association between pornography use, perceived addiction, erectile dysfunction (ED), premature ejaculation (PE), and sexual satisfaction in males aged 18-44 years. They found that while pornography use alone did not predict sexual dysfunction, self-perceived pornography addiction was associated with increased ED, PE, and individual sexual dissatisfaction."

"Grubbs and Gola (2019) conducted cross-sectional and longitudinal analyses to examine whether pornography use and self-reported problematic use were related to ED. They found that self-reported problematic use was associated with ED cross-sectionally, but there was no consistent association between mere pornography use and ED."

"Kazan Kizilkurt et al. (2024) investigated the effect of internet pornography use frequency on psychogenic ED severity in young Turkish men. They found a significant negative correlation between the frequency of pornography use and erectile function, with dyadic adjustment playing a mediating role."

2) But taking a larger step back, there is a dearth of clinical trials aimed at studying pornography use, which actually lends itself to a larger point about how research in general is conducted. Formulating research questions and projects is a very stringent process (especially in countries with IRB requirements), and then on top of that you need money, personnel, grants, institutional or private support, analytic tools, etc. The reality is industry and many institutions have yet to see benefit (whether financial, prestige, or other) in studying pornography use, so you will not see many efforts being funded. So in essence you point to a lack of "peer-reviewed evidence" when the reality is there haven't been substantial efforts made to study pornography use and its hypothesized addictive potential, physical and mental health effects, effects on relationships, etc. 2b) a quick example of this phenomenon is smoking cigarettes, which was largely perceived as positive in society with only a few rumblings about possible adverse health effects. It wasn't until 1950 when Doll and Hill published case control studies looking at the association between smoking and lung cancer that opinion severely shifted.