Supernormal stimulus and the dopamine spike–crash cycle
Porn is a 'supernormal stimulus' — it spikes dopamine high, and strong spikes are paid back with a drop below baseline; the bigger the hit, the deeper the crash and the harder the chase for the next one.
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Background
Dopamine is the chemistry not only of pleasure but of motivation and reward. Porn acts as a supernormal stimulus: it lifts dopamine from a baseline (~6) to ~14–15, likely higher than many natural rewards. The catch is that the system seeks homeostasis: with frequent, strong stimulation a rise is followed by a drop below baseline before returning to normal (the pleasure–pain balance). That trough feels like lack of drive, lack of motivation, intrusive or depressive thoughts and loss of purpose — a state uncannily like ‘ADHD’. In the trough the brain chases the ‘next shiny object’ (porn, social media, YouTube) to pull itself out, which fuels jumping attention. The more often you press the button, the more stimulus you need (tolerance), and algorithms add ‘online drift’: serving ever more extreme content to keep the same level of arousal. By contrast, gentle rises (e.g. 6 to 7.5 after a workout) leave a shallow trough — you lose a little motivation but don’t crash. Hence two levers: get off the big spike, and replace it with frequent small wins near baseline.
(The 6→14 figures illustrate a popular pleasure–pain balance model (Anna Lembke, ‘Dopamine Nation’), not literal measurements — dopamine from porn has not been directly measured in humans, and porn’s status as an ‘addiction’ is scientifically contested.)