If you have studied Chinese for a while, you probably already know that,
黄色 Huáng sè is the word for ‘yellow’ in Chinese. However, do you know that, 黄色 also has another meaning, which is… …yup, porno.
黄色小说 Huáng sè xiǎo shuō pornographic novel
黄色笑话 Huáng sè xiào huà Dirty jokes
你很黄色 Nǐ hěn huáng sè You are so dirty minded
Some say that, apparently is because during the end of the 19th century, the pornographic books from England often with a yellow cover page, so that gradually ‘yellow‘ became the word for porno.