This paper aims to determine via responses to three questionnaire surveys how sexuality education programs are conducted at junior high schools in Japan. Study 1 examined the practice of sexuality education in schools, Study 2 investigated junior high school students' (age 12-13 and 14-15 years) knowledge of sexuality, and Study 3 examined parents'/guardians' views on sexuality education. For Study 1, 703 principals of 5158 junior high schools returned an original questionnaire (13.6% recovery rate), and for Studies 2 and 3, 9492 students and 5374 parents returned questionnaires (86.2% and 60.3% recovery rate, respectively). In Study 1, an average of 9.19 hours of instruction was allocated to sexuality education over three grades. In Study 2, the average correct response rate was as low as 34.5% for boys and 39.4% for girls, with many answering "I don't know." Approximately one-half of the boys indicated there was nothing in particular they wanted to know about sex and no-one they wanted to consult. In Study 3, parents viewed school as a more appropriate setting than home for teaching physiological aspects of sexuality and providing accurate information. From the results of the three studies, we discuss the current situation and future challenges for sexuality education in Japan. (Contains 9 tables.)