In the two years that I’ve been reporting about Civitai, a platform for sharing AI image generation models that has been instrumental in the production of AI generated non-consensual porn, Civitai has consistently argued that the amount of adult content on the site has been overstated. But new research shows that, if anything, the amount of adult content on Civitai has been underestimated.
In their paper, “Perpetuating Misogyny with Generative AI: How Model Personalization Normalizes Gendered Harm,” researchers Laura Wagner and Eva Cetnic from the University of Zurich studied more than 40 million user-generated images on Civitai and over 230,000 models. They found “a disproportionate rise in not-safe-for-work (NSFW) content and a significant number of models intended to mimic real individuals” on the platform, they write in the paper.
“What began as a promising creative breakthrough in TTI [text-to-image] generation and model personalization, has devolved into a pipeline for the large-scale production of sensational, biased, and abusive content. The open-source nature of TTI technologies, proclaimed as a democratizing force in generative AI, has also enabled the propagation of models that perpetuate hypersexualized imagery and nonconsensual deepfakes,” Wagner and Cetnic write in their paper. “Several indicators suggest a descent into a self-reinforcing feedback loop of platform decay. These include a dramatic increase in NSFW imagery, from 41% to 80% in two years, as well as the community’s normalization of deepfakes, misogynistic tropes, and other exploitative content.”
To visualize just how dominant adult content was on Civitai, check the chart below, which shows the distribution of images by “NSFW browsing levels” over time. These categories, which are inspired by the Motion Picture Association film rating system and are used by Civitai to tag images, show that adult content was always a significant portion of all images hosted on the site, but that the portion of “overtly sexual, or disturbing” content only grew as the site became more popular, and exploded starting in 2024. The chart is based on Civitai’s own numbers and categorization system which the researchers scraped from the site. It likely undercounts the number of explicit images on the site since as both the researchers and I observed during my reporting, not all adult content is tagged as such.
In December, 2023, Civitai CEO Justin Maier told Venture Beat that “less than 20% of the posted content is what we would consider ‘PG-13’ or above.” When I reached Maier for comment for this article, he told me that “The VentureBeat figure cited a December 2023 snapshot, when adult posts were a minority. The mix shifted in 2024 as many NSFW creators migrated from platforms that no longer allow that content.”
However, the data in the paper shows that by October of 2023, 56 percent of all images on the site were tagged as “NSFW” and were designated by Civitai as “PG-13” or above.
In May, Civitai announced it’s banning all AI image generation models designed to recreate the likeness of real people because of pressure from payment processors. Since the authors of the paper were already tracking hundreds of thousands of models hosted on Civitai, they could easily see which models were removed, giving us a first clear look at how common those models were.
Overall, they saw that more than 50,000 models designed to AI-generate the likeness of real people were removed because of the ban. These are models that Civitai itself tagged as “person of interest,” the tag it uses to indicate a model recreates the likeness of a real person, so the actual number of models depicting real people is likely higher.
It’s hard to say if the most popular AI models on Civitai were all popular just because they were used to generate explicit images, because people could use models tagged as NSFW to generate non-nude images and vice versa. For example, according to the data collected by the researchers the most popular AI image generation model on Civitai was EasyNegative with almost 600,000 downloads. It’s not tagged or promoted as a model for generating pornography, but images that users created with it, which are shared on its Civitai model page, show it is commonly used that way.
Other very popular models on Civitai are clearly designed to generate explicit images. The sixth most popular model with 360,000 downloads is Nudify XL: Better Bodies, which its creator says is for “nude female frontals.” A model called Realistic Vaginas - God Pussy 1 had 256,000 downloads. The POV Squatting Cowgirl LoRA model, which Civitai tagged as a “sex” model, had 189,000 downloads.
The authors of the paper also conducted deeper analysis of the 40,000 most downloaded models on Civitai. In the 11,151 models where they could extract textual training data, meaning text that indicates what kind of images the models were trained on, they found “specifically abusive terms.” 5.6 percent included the keywords “loli” (558 models) and/or “shota” (69 models), Japanese terms commonly used to refer to sexualized depictions of pre-pubescent girls and boys. About 2.1 percent (189 models) included the keyword “rape.”
The data shows with clear numbers what we have long argued at 404 Media: adult content drives technological innovation and early adoption, and this has been especially true in the world of generative AI. Despite its protestation to the contrary, Civitai, which is one of the fastest growing platforms in that industry, and that the influential Silicon Valley venture capital firm Andreessen Horowitz invested in, grew because of explicit content, much of which was nonconsensual.
“The rapid rise of NSFW content, the over-representation of young female subjects, and the prioritization of sensational content to drive engagement reflect an exploitative, even abusive dynamic,” the researchers wrote. “Additionally, structural discrimination embedded in today’s open-source TTI tools and models have the potential to cause significant downstream harm as they might become widely adopted and even integrated into future consumer applications.”
Adult content driving innovation and early adoption doesn’t have to be harmful. As the researchers write, it’s the choices platforms like Civitai make that give us these outcomes.
“The contingent nature of technology, shaped by online communities, platform operators, lawmakers, and society as a whole, also creates opportunities for intervention,” they write. “Model-sharing hubs and social media platforms both have the capacity to implement safeguards that can limit the spread of abusive practices such as deepfake creation and abusive imagery.”
