A survey has revealed that 52 percent of Chinese couples are dissatisfied with their sex lives. The survey, carried out over half a year by the International Society of Sexual Medicine (ISSM) and the Chinese Society of Andriatrics (CSA) under the Chinese Medical Association, polled more than 3,500 people aged 18 to 45 in nine locations across the Asia-Pacific region. Released on Thursday, the survey on 1,002 Chinese people in 11 cities including Beijing, Shanghai, Guangzhou and Wuhan, of which 503 are females, showed that 96 percent of Chinese female respondents said they hoped for prolonged sexual intercourse, far higher than the average of 63 percent of women in the Asia-Pacific region. According to the survey, 32 percent of men polled said they suffered from premature ejaculation (PE), and 70 percent of PE sufferers in China have not sought medical treatment. \"Many of the Chinese men are concerned that their performance may not meet the satisfaction of their partners, and the cause of such concern is largely related to PE,\" said Jiang Hui, senior member of the CSA. Jiang said that factors for PE include genetic predisposition and mental health problems such as stress, fatigue and anxiety, and suggested that men suffering from the condition seek treatment at hospitals.