According to the content progression thesis, porn users seek more extreme content with continued use.

A two-year study tracked porn use and preferences in a sample of young men.

Preferences for violent and coercive content actually decreased across the study period.

These findings suggest that porn use doesn't lead to a tolerance effect.

Popular media articles often talk about pornography as if it has effects similar to those of drugs. Among other things, these reports claim that consumers build up a tolerance to porn over time, meaning that they eventually need to seek out increasingly extreme content in order to become aroused and/or to reach orgasm.

Researchers have dubbed this idea the content progression thesis and it has been discussed in the scientific literature for more than 30 years. During that time, a few small studies have emerged that provide support for it. However, all of those studies have suffered from the same limitation: People were only surveyed once and they were asked to report on how their pornography use had changed over time. Studies like this are subject to memory and recall biases, and they don’t allow us to make any........

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