PURPOSE: This study was done to discover the contents needed for a sexual education program in the lower grades (the first to the third grade) by primary school teachers and to discover difficulties in confronting sexual education. METHOD: This was a descriptive study of 198 teachers for lower grade students in 15 primary schools. A questionnaire on sexual education was distributed and collected by mail. RESULT: The contents for sexual education that teachers felt were highly needed are as follows: sanitation of genitals, sexual violence, pregnancy & childbirth, family, self-assertion, and sexual self-determination. Teachers think prevention of sexual violence is the main reason for sexual education. Teachers indicated that sexual education considering the developmental stage was difficult. CONCLUSION: Development of a sexual education curriculum for lower grade primary school students is necessary for increasing the problem-solving ability of students focused on sexual violence, self-assertion and sexual self-determination, in addition to providing simple information.