Objectives It is intended to be provided as basic data to find out the perception of “sex” of mothers with children in fifth and sixth grades in elementary school in Korea and seek ways to develop sex education programs thereafter.
 Methods From 2001 when comprehensive sex education was activated to 2022, when a new trend of sex education was introduced, a total of 7,614 documents were searched to find out the gender perception of mothers with 5th and 6th graders in Korea. Related literature examined abstracts, research design and research methods, and research results, and looked at parents' satisfaction with changes in adulthood. Next, from November 1st to December 30th, 2022, 20 mothers who applied for child sex education in the 5th and 6th grades of elementary school were recruited to conduct a total of 16 hours and 8 interviews for 2 hours per team from January 2nd to March 3rd, 2023. Interview interviews were transcribed including all prominent or distinctive cases such as mother's verbal expression, body movement, non-verbal expression, and team atmosphere, and related contents were visualized with frequency analysis and word cloud for easy recognition.
 Results The perception of “sex” of mothers with children in the 5th and 6th grades of elementary school in Korea was as follows. First, the perception of adulthood was different according to the mother's social and personal perceptions, and negative perception and sexual attitude were shown. Second, mothers only had a superficial understanding of sex education, and it was found that smooth interaction with their children about “sex” was difficult. Third, changes in perception of the occurrence of sex problems and the need for practical preventive education were highlighted. Fourth, it was found that communication about “sex” was difficult even in close mother-child relationships. Fifth, it was found that realistic response to children's sexual curiosity was insufficient and difficult. Sixth, it was confirmed that sex education for mothers functions as a bridge for mothers and children and leads to an understanding of their children's proper sex.
 Conclusions For mothers with fifth and sixth graders in elementary school in Korea, “sex” should no longer be a sensitive topic, but systematic methods and measures should be sought to educate them to prevent sexual issues in their daily lives.