Worked for a US based company in the late 90s
Due to an inordinate amount of smut a proxy server, requiring user login, was set up for internet access.
This also Included full logging of sites accessed.
Management chain approval was required to get WWW access on this new full accountable set-up.
Everyone trod carefully.
After a few weeks the rumour went that smut was still being accessed.
Turned out to be the CEO's son-in-law all along.