Chinese sociologist Pan Guangdan has documented acceptance of same-sex relationships in China going back thousands of years, suggesting that tolerance for LGBTs may be coming full circle in the People’s Republic of China.

Pan made the discovery while translating the 1933 Havelock Ellis book Psychology of Sex from English into Chinese.

Ellis was the first person to author a medical textbook on homosexuality and the book inspired Pan to see what evidence there was for homosexuality in Chinese historical documents.