Results: The traditional Confucian cultural norms were not weakening evenly, with more entrenchment in Hani than in Shanghai and Taipei. Prevalence of sexual coitus among adolescent and young adults was lowest in Hanoi and highest in Taipei, while similar profiles of other intimate behaviors were displayed in the three cities. Associations between respondents’ sexual behavior and their cultural concepts and values differed by city. In Hanoi. For all four cultural measures, respondents with more traditional views were less likely to engage in sexual activity. This was also true in Shanghai and Taipei with respect to traditional sexual values and self-cultivation values. However. there was an inverse relationship between sexual behavior and traditional family concepts and gender roles in Shanghai and Taipei; those with more traditional values were more likely to have premarital sexual intercourse, except with regard to family values among female youth in Taipei.