Objective To investigate current status of knowledge about, attitude towards, and behavior of sex among middle school students in Wujiang City. Methods 3 120 students from 3 middle schools in Wujiang City were surveyed using a self - administered questionnaire. Results The earliest menarche age was 9 for female students, and 69. 2 % of girl students had first menarche before 12 years. 28. 96 % of male students had first spermatorrhea before 12 years. 56. 23 % of male students and 43. 64 % of female students had attitude in favor of the puppy love. 48. 83 % of males and 26. 53 % of females had a love history. 41.82 % of males and 8. 10 % of females had attitude favorable towards premarital sex. 6. 10 % of males and 33. 97 % of fe-males had consulted parents when they have had sex perplexities. Knowledge about sex was mainly from school-metes, extra -curricular books and teachers for males, and from schoolmates, teachers and parents for females.Conclusion Knowledge about sex among high school students is inadequate, and more sexual health education should be carried out in middle schools.
