This study aims to understand Macao parents’ experience, attitudes, and perceptions in the implementation of early childhood sex education within the context of the family. Three aspects will be analyzed in this thesis: 1. Parents’ experience and attitudes in the implementation of sex education among young children; 2. Parents’ demand for early childhood sex education and the difficulties encountered; 3. Measures and obstacles in implementing early childhood sex education in Macao society. This study allows researchers and policymakers to try to establish effective early childhood sex education programs to promote to parents and schools. This research employs qualitative methods and collects data through semi-structured in-depth interviews with a total of ten respondents (seven women and three men) from 10 families in Macao. All ten respondents have one or more daughters attending the same Catholic girls’ school (kindergarten session) at the time of the research. Through coding and thematic analysis of individual interviews, the research shows that parents in Macao face obstacles from the traditional Confucian culture, their professional and educational backgrounds in integrating sex education in their children’s early childhood development. Some parents think that "sex" education should not be introduced to preschool children, as "sex" is taboo and forbidden in their established belief. But with the gradual opening of education, local culture and society, the respondents have shown increasing willingness to help children expand their knowledge and commit to ethical behavior change. Through a series of government measures to promote moral education courses, "sex" is no stranger taboo V to parents, but we still need to improve and optimize positive measures to achieve more sustainable development in this aspect. The results also show that parents-respondents were trying through various channels or methods to improve parent-child relationship. For instance, adults’ own relationship with their parents in the past, such as lack of care and affection, also tends to be projected on the existing parent-child relationship. The research calls for more attention paid to interaction between parents and children and the improvement of family atmosphere with the support of the other spouse (usually the father). Finally, often due to the respondents’ lack of education experience, they think "sex" identity and knowledge can be naturally acquired with age, but this natural acquisition without proactive measures is often ridden with challenges. Factors including parental communication skills and expertise, working hours, marital relations, child’s gender, and caregivers’ education background, all have an effect on the kinds of challenges children and families face in early childhood sex education. By sharing local news to increase respondents' awareness of sexuality-related crime and crises, this research also hopes to encourage parental reflection on and collective social action to address sexual tragedies in the Macao society.