Other, less literary, terms have included "male trend" (), "allied brothers" (), and "the passion of Longyang" (), referencing a homoerotic anecdote about Lord Long Yang in the Warring States period. The formal modern word for "homosexuality/homosexual(s)" is "tongxinglian" () or "tongxinglian zhe" (, homosexual people). Instead of that formal word, "tongzhi" (), simply a head rhyme word, is more commonly used in the gay community. "Tongzhi" (; sometimes along with "nü tongzhi", ), which was first adopted by Hong Kong researchers in Gender Studies, is used as slang in Mandarin Chinese to refer to homosexuals. Such usage is seen in Taiwan. However, in mainland China, "tongzhi" is used both in the context of the traditional "comrade" sense (e.g., used in speeches by Communist Party officials) and to refer to homosexuals. In Cantonese, "gei1" (), adopted from English "gay", is used. "Gay" is sometimes considered to be offensive when used by heterosexuals or even by homosexuals in certain situations. Another slang term is "boli" (), which is not so commonly used. Among gay university students, the acronym ""datong"" (), which also refers to utopia, in Chinese is becoming popular. "Datong" is short for "daxuesheng tongzhi" (university students [that are] homosexuals).