GTA 6 Was Almost Refused Classification in South Korea Over Nudity
South Korea's rating board nearly blocked GTA 6 due to the amount of genital exposure, according to a news article.

Grand Theft Auto VI faced a significant hurdle in South Korea, where it was almost refused a classification rating. The reason cited by the country's game rating and administration committee was the sheer amount of genitals shown in the game.
The article indicates that the level of nudity presented a major challenge for the board's approval process. The classification decision was described as a close call.
Details on how the issue was resolved are not provided in the article.
This is not the first time the Grand Theft Auto series has encountered friction with classification boards worldwide over its mature themes. The specific mention of genital exposure, however, marks a notably direct reason for a near-ban from a national ratings body.
Rockstar Games has not issued a public statement regarding the South Korean classification process.
Source: GamesRadar GTA 6