Objective: To study male sexual function

including prevalence rate and risk of erectile dysfunction and premature ejaculation

frequency of intercourse at district of Chongqing. Methods: The investigation was conducted randomly by the questionnaire made by Beijing University in the community-based sample of men aged 18-69years during July to October in 2001 in Chongqing. The questionnaire includs questions on somatic and social factors and sexual activity that consisted in Chinese index of erectile function (CIEF)

premature ejaculation and frequency of intercourse during an average month. There were the self-appraised erectile dysfunctions that respondents appraised themselves and the credit erectile dysfunctions that based on CIEF less than 22. Results: The incidence of the credit erectile dysfunctions was 44.8% and that of the self-appraised erectile dysfunctions was 21.5%. In these men over 40 years old was 69.7%

37.4% respectively. Of these men 8.1% had premature ejaculation. Frequency of intercourse during an average month decreased with increasing age. There were many risk factors such as somatic disease and social factors which affected erectile dysfunctions. Conclusion: Frequency of intercourse during an average month decreased with increasing age on the contrast that the incidence of the credit erectile dysfunctions and premature ejaculation increased. Somatic disease and social factors had an effect on erectile dysfunctions.