The negative effects of porno requires backing up? Happy to oblige! But 1st of all I would like to contest that acceptance of violence against women & mental health issues are not "small negative consequences", but severe detriments to women & mental health sufferers.

THREAD! https://twitter.com/SaintFelixVI/status/1325203423801864192

Anyway, onto porn. Let us begin by establishing that pornography addiction is real and verifiable. The paper Neuroscientific Approaches to (Online) Pornography Addiction by Stark & Clucken (2017) affirms that all current research supports the concept of pornography addiction.

I hope I don't need to elaborate on why addictive disorders are harmful to individuals. I accept the use of the PPSC-6 scale for assessing problematic pornography consumption (Bothe et al. 2020).

The effects of pornography in affecting the way people view the world is well documented. "Less Than Human? Media Use, Objectification of Women, and Men’s Acceptance of Sexual Aggression" (Seabrook, Ward, Giaccardi, 2018) found that consumption of pornography was associated...

...with greater acceptance of objectification of women, which in turn was associated with greater rape myth acceptance and more frequent acts of sexual deception.

These findings are supported by an extensive body of past research.

"Men’s Objectifying Media Consumption, Objectification of Women, and Attitudes Supportive of Violence Against Women" (Wright, Tokunaga, 2015) found that men who are frequently exposed to pornography are more likely to vie women as sex objects and to endorse violence against women

Such attitudes have been foundto predict sexually aggressive inclinations and behaviors in both cross-sectional and longitudinal studies (Hald et al., 2010).

"Pornography Viewing among Fraternity Men: Effects on Bystander Intervention, Rape Myth Acceptance and Behavioral Intent to Commit Sexual Assault" (Foubert, Brossi, Bannon, 2011) was the most alarming one for me. That pornography, which often depicts excessive violence towards...

...women results in the normalising of that violence should be a given. But this study found that men who view pornography are significantly less likely to intervene as a bystander during rape and are more likely to report an increased behavioral intent to rape.

So to reiterate that: not only does porn make men more violent, it also makes them more accepting of violence towards women. Others studies (Mikorski and Szymanski, 2017) affirm the findings that porn upholds sexual violence, assault culture, and objectification of women.

As for mental health and effects on the brain, this list is even more exhaustive, so I will cover just a few studies - though I can happily delve into more if needed.

I'll start with the latter by citing "Exposure to Sexual Stimuli Induces Greater Discounting Leading to Increased Involvement in Cyber Delinquency Among Men" (Cheng and Chiou, 2018) which found that porn use leads to poorer executive functioning and greater impulsivity...

...in brain processes. This is backed up by another study which found differences in impulsivity, decision making, spatial working memory, problem solving, and emotional dysregulation, more significant to other sexual behaviours (Leppinka, Chamberlaine, Redden, Grant 2016).

The mental health effects are well documented too. "Hidden in Shame: Heterosexual Men’s Experiences of Self-Perceived Problematic Pornography Use" (Sniewski, Farvid, 2020) is a qualitative study that found that pornography use is associated with guilt and shame...

...increased objectification, sexual dysfunction, unhealthy expectations for sex, and poorer self-esteem and mental health outcomes. "Examining Correlates of Problematic Internet Pornography Use Among University Students" (Harper and Hodgins 2016) backed this up, concluding...

...that porn addiction is linked with depression and anxiety, and correlates with drug, gambling, and alcohol addictions.

"Examining the Psychometric Properties of the Yale–Brown Obsessive–Compulsive Scale in a Sample of Compulsive Pornography Users" (Kraus et al. 2015) and Psychometric Development of the Problematic Pornography Use Scale (Kor et al. 2014), as well as two others [1][2]...

...both back up the finding that porn use is linked to depression and anxiety.

[1] Dirty Habits? (Egen, Parmar, 2013)
[2] When is Online Pornography Viewing Problematic Among College Males? (Levin, Lillis, Hayes, 2012)

I hope this is suffices as evidence to my claims.