Objective: To understand prevalence of male homosexuality in Hangzhou, Zhejiang Provicne of China.
Methods: To investigate emerging rate of male homosexuality and infer its prevalence in public gathering by observation at fixed points and questionnaire survey in gay men.
Results: There were 2 012.5 male homosexuals taking part in public gatherings, with 95% confidence interval of 1 899 - 2 129, in Hangzhou. Frequency of such activities they took part in was once every 3 - 15 days (11.3 +/- 2.7) days. Each gay man knew 1.51 +/- 0.33 (0 - 6) other male homosexuals who never exposed their sexual orientation. The emerging number of male homosexuals was 5 051.38.
Conclusion: The emerging rate of male homosexuality was 0.58%, with its prevalence of about 1% - 2% in public gatherings in Hangzhou.