Blocked on Weibo

六合彩 (Mark Six / liùhécǎi) is a lottery organized in Hong Kong. Mark Six is akin to the Pick-6 lotteries prevalent in the U.S.

Why it is blocked: The general word for lottery (彩票 / cǎipiào) is unblocked, however, this regional Cantonese version is. All gambling was officially banned by the CCP in 1949 for its immoral and supposed colonial influences (despite the fact that China has a long history of gambling, including supposedly having “invented” the state lottery, with Keno slips from the Chinese Han Dynasty believed to have helped finance the building of the Great Wall). However, cracks began to show when China instituted a pair of state lotteries for the public welfare in 1987 and permitted horse betting in Wuhan in 2003.

性交 (xingjiao) is the act of sexual intercourse. The term is used in sex-related words, including 近親性交 (incest / jinqinxingjiao), 性交体位 (sexual positions / xingjiao tiwei), 三人性交 (threesome / sanrenxingjiao), and others, all of which are banned.

Why it is blocked: Looks like some things haven’t changed since 2005 (when xingjiao was discovered to be blocked on instant messaging programs). A cursory test shows that most of those words are still blocked, though some critics contend that doesn’t stop young folks from using the service for illicit purposes.

一夜情 (one-night stand / yiyeqing) was originally a single theatre performance, usually by a guest performer(s) on tour, as opposed to an ongoing engagement. Today, however, the term is more commonly defined as a single sexual encounter, in which neither participant has any intention or expectation of a relationship to come out of it.

Why it is blocked: Because sex is a touchy subject in China.