Researchers at the University of Zagreb tracked 248 male high school students over a two-year period to study their pornography preferences. Contrary to popular belief, the study found that interest in violent or coercive material actually diminished during the observation period.
The 30-year debate over the "content progression thesis"
For more than three decades, the "content progression thesis" has served as a cornerstone of scientific and social discussions regarding pornography consumption. This theory posits that users develop a tolerance to sexual content in a manner similar to drug users, eventually requiring increasingly extreme, violent, or coercive material to achieve the same level of arousal or satisfaction.
As the report explains, this idea has historically been used to suggest that continued consumption leads to a dangerous escalation in demand for taboo content. while some smaller studies have previously offered support for this escalation, those studies were often limited by their reliance on retrospective data, where participants were asked to recall their past behaviors from memory rather than having their habits documented in real-time.
From 8.1% to 4.6% in the University of Zagreb study
A new longitudinal study conducted by researchers Landripet, I., Buško, V., and Štulhofer, A. at the University of Zagreb provides a significant challenge to the escalation narrative. By surveying 248 male high school students at five different intervals over two years,the team was able to observe actual shifts in preference rather than relying on memory. The participants, who were an average of 16 years old at the start of the study , completed their surveys online every six months.
The findings, as reported in the study, show a distinct downward trend in the interest of the group. At the beginning of the research period, 8.1% of the participants reported a preference for violent or coercive pornography. By the fourth data collection phase, that number had dropped to a study low of 4.6%. This data suggests that, for this demographic, the "tolerance" required to drive users toward more extreme content does not appear to manifest as the progression thesis predicts.
Why frequent users showed a less marked decline
While the general trend moved toward less extreme content, the University of Zagreb researchers noted a nuance regarding the frequency of use. the data indicated that students who consumed pornography more frequently at the start of the study did not experience as sharp a decline in their preference for extreme material as their less frequent counterparts.
According to the researchers,this finding does not necessarily validate the content progression thesis. Instead, the authors suggest that frequent users may simply possess more diverse interests, leading them to seek out a wider and more varied range of pornographic content rather than moving strictly upward on a scale of extremity. this distinction is vital for understanding whether "heavy use" equates to "escalating extremity."
What the two-year window and male-only sample leave unanswered
Despite the strength of the longitudinal design, the study contains specific limitations that prevent a universal conclusion. Because the research focused exclusively on young men and only spanned a two-year period, it remains unknown if these patterns hold true for female consumers or older adult populations. Furthermore, the study focused specifically on violent and coercive content, leaving the question of whether users seek other forms of extreme material over longer periods of time unanswered.
The results do, however, cast significant doubt on the popular "porn-as-a-drug" analogy. by showing that tolerance does not necessarily lead to a demand for more violent material, the study suggests that the content progression thesis may not hold up under rigorous, real-time scrutiny. Future research will need to determine if these findings extend to a broader range of extreme content and more diverse demographics.
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