To understand and identity the meaning of sexuality in middle school girls and boys, the qualitative research was done. We made the in-depth unstructured interviews with 33 participants form July to October 1998. We analyzed the data according to the Collaizzi's phenomenological method. After repeated reading and interpretation of data, 15 themes and 7 basic structures were deducted. Followings were 7 basic structures: physical touch and exposure, relationship with male and female, difference between male and female, natural and inevitable life process, something should be hidden, interest and abstinence, and female as victim. According to above results, we would like to propose followings on the sexuality of middle school students: First, the research on the meaning of sexuality of high school and university students should be followed-up. Second, the measuring tool of sexual behaviour of the middle school students should be developed including the contents of 15 themes and 7 basic structures of this study.