Sex education is considered as a rather sensitive topic in school worldwide, and differs in various aspects. It involves policies of governments, devoted resources, social norms, education of teachers, depth of content and feedback from students. Eastern countries and regions are more conservative. Though policies have been revised on supporting sex education in school and effort on balancing resources have been made, there are still difficulties to overcome. For instance, violating social norms, educating teachers to know the strategies on giving sex education and being provided with feedback from students in order to improve tactics used. Western countries are generally more open to sex education in school, resources have been devoted into it and policies have been made decades ago. Though it is controversial on which kind of sex education is most suitable for students, governments would listen to feedback from students and teachers on their advices. This paper provides with detailed conclusion on the above-mentioned points comparing between Eastern and Western aspects on teaching sex education in school.