
State age verification laws since 2023 cut adult site time by 10%. The other 90% continued through VPNs or noncompliant sites, a new NBER study finds.
State age verification laws reduced time spent on adult websites by roughly 10% since 2023, according to a new working paper from the National Bureau of Economic Research. The headline figure masks heavy substitution and circumvention.
Matthew Brown, Emily J. Davis, and Devin G. Pope studied individual-level browsing data across 25 states that passed laws requiring adult sites to verify users' age. Prominent platforms including Pornhub responded by blocking all local access rather than implement verification. The authors tracked what happened to the traffic that disappeared from compliant sites.
For every 100 hours users had spent on the top adult sites before restrictions, about 50 hours migrated to noncompliant platforms that never restricted access. Another 30 hours reappeared via VPN-based circumvention. Ten hours shifted from compliant to noncompliant sites. The remaining 10 hours represented time that users simply stopped spending on adult content.
In other words, only one-tenth of the restricted activity was truly eliminated. Half flowed to websites that ignored the law entirely. Nearly a third was restored through technical workarounds.
The findings offer a rare empirical look at how users respond to online content restrictions. The 30% VPN share suggests that the barrier to circumvention remains low for motivated users. The 50% shift to noncompliant platforms indicates that a large portion of the adult site ecosystem operates outside the reach of state law.
For companies that provide VPN services, private browsing features, or uncensored hosting, the paper points to continued demand as more states weigh similar restrictions. Platforms that comply with verification laws risk losing audience to less regulated competitors. The dynamic echoes broader debates around content moderation and liability that have shaped legislative proposals in areas from social media to encrypted messaging.
The study comes as lawmakers in other states consider their own age verification bills. If the pattern holds, the next battleground will not be the verification law itself but the ability to block noncompliant sites and detect VPN usage. Both are technically difficult and legally contested.
The paper provides a baseline for that debate. The authors estimate that about 90% of pre-restriction usage continued through some channel. That number will inform how regulators, privacy advocates, and platform operators calibrate their next moves.
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