BEIJING — A leading Chinese sexologist’s revelation that she’s been living with a transgender man for 17 years has sparked a rare public discussion about China’s largely invisible and marginalized transgender community. Chinese still hold deep prejudices against sexual minorities despite government efforts to achieve equality. Li, a sociologist who is retired from the China Academy of Social Sciences, is known not only as a leading expert on homosexuality, but also as the widow of well-known Chinese author Wang Xiaobo, adding to the huge reaction her disclosure received. Hu Zhijun, executive director of Parents, Families, Friends of Lesbians and Gays of China, applauded Li’s bravery and candor in revealing her relationship and praised her for shining a light on transgender Chinese, who are faced with greater social pressure than homosexuals because they do not identify with their physical gender.