South Koreans must enter their national ID number to access internet adult content!

The South Korean government censors the internet. They also censor election information. They have blocked over 30 sites seen as sympathetic to North Korea. In 2007, numerous bloggers posts were deleted for their criticism of the presidential candidates.

Sites with unrated games, pornography, and gambling have also been blocked. They keep a tight grip on what their citizens can access on the internet.

(Source)