1. AboutKidsHealth (2019). Sexuality: What children should learn and when. AboutKids Health. https://www.aboutkidshealth.ca/Article?contentid=716
2. AIDS Concern. (2016). Demonstration scheme: A positive approach to sexuality education enhances the motivation of youth to practise safer sex. Hong Kong: AIDS Concern
3. Andres, E. B., Choi, E. P. H., Fung, A. W. C., Andres, E. B., Choi, E. P. H., Fung, A. W., et al. (2021). Comprehensive sexuality education in Hong Kong: Study protocol for process and outcome evaluation. BMC Public Health, 21, 197. https://doi.org/10.1186/s12889-021-10253
4. Boey, K. W., & Ng, H. N. (2021). Child sexual abuse: Sexual self-concept and psychological functioning. Research Unit on Love, Marriage and Family, Caritas Institute of Higher Education. Hong Kong.
5. Brownell, C. A., Zerwas, S., & Ramani, G. B. (2007). “So Big”: The development of body self-awareness in toddlers. Child Development, 78(5), 1426-1440. https://doi.org/10.1111/j.1467-8624.2007.01075.x
6. Byers, E. S, Sears, H. A., Voyer, S. D., Thurlow, J. L., Cohen, J. N., & Weaver, A. D. (2003). An adolescent perspective on sexual health education at school and at home. Canadian Journal Human Sexuality, 12(1), 1-17.
7. Cheng, I. (2018). Information note: Sexuality education. In Information note of the 6th legislative council: Research office of Legislative Council Secretariat. https://www.legco.gov.hk/research-publications/english/1718in03-sexuality-educ cation-20180109-e.pdf.
8. Education Department. (1997). Guidelines on sex education in secondary schools. Hong Kong: Government Printer.
9. EEGSE (European Expert Group on Sexuality Education) (2016). Sexuality education: What is it? Sex Education, 16(4), 427-431. https://doi.org/10.1080/ 14681811.2015.1100599
10. Fok, S. C. (2005). A study of the implementation of sex education in Hong Kong secondary schools. Sex Education, 5(3), 281-294. https://doi.org/10.1080/1468 1810500171458
11. FPAHK (Family Planning Association of Hong Kong). (2017). The report of youth sexuality study 2016. Hong Kong: FPAHK
12. HKASERT (Hong Kong Association of Sexuality Educators, Researchers and Therapists). (2016). Survey on secondary school sex educators’ opinion towards sex education. Hong Kong: HKASERT.
13. Hilton, G. L. S. (2003). Listening to the boys: English boys’ views on the desirable characteristics of teachers of sex education. Sex Education, 3(1), 33-45. https://doi.org/10.1080/ 1468181032000052144
14. FPAHK (Family Planning Association of Hong Kong). (2017). Youth sexuality study 2016. Hong Kong: FPAHK.
15. Gordon, P. (2008). Review of sex, relationships and HIV education in schools. UNESCO. https://unesdoc.unesco.org/ark:/48223/pf0000162989
16. Goldfarb, E. S., & Lieberman, L. D. (2021). Three decades of research: The case for comprehensive sex education. Journal of Adolescent Health, 68(1), 13-27. https://doi.org/10.1016/ j.jadohealth.2020.07.036
17. Kirby, D. (2008). The impact of abstinence and comprehensive sex and STD/HIV education programs on adolescent sexual behavior. Sexuality Research and Social Policy, 5(3), 18-27. https://doi.org/10.1525/ srsp.2008.5.3.18
18. Lo, S. L. (2011). Students' opinion on sexuality education in schools and appropriateness of different approaches (MEd dissertation). Hong Kong: The University of Hong Kong.
19. Mathews, C., Boon, H., A., Flisher, A. J., & Schallma, H. P. (2006). Factors associated with teachers’ implementation of HIV/AIDS education in secondary schools in Cape Town, South Africa. AIDS care, 18(4), 388-397. https://doi.org/10.1080/ 09540120500498203
20. Milton, J. (2003). Primary school sex education programs: Views and experiences of teachers in four primary schools in Sydney, Australia. Sex Education, 3(3), 241-256. https://doi.org/ 10.1080/146818103 2000119122
21. Mkumbo, K. A. (2012). Teachers’ attitudes towards and comfort about teaching school-based sexuality education in urban and rural Tanzania. Global Journal of Health Science, 4(4), 149-158. https://doi.org/10.5539/gjhs.v4n4p149
22. Ng, H. N. (2016). Sexual problems in Hong Kong Chinese community. Current Sexual Health Reports, 8(3), 151-157. https://doi.org/10.1007/s119 30-016-0082-1
23. Ng, H. N. (2018). Adolescents’ love, sex, and holistic development. Journal of Youth Studies, 21(2), 105-113.
24. Ng, H. N., Boey, K. W., & To, H. K. (2019). The perspective of Hong Kong secondary students on sexuality and sexual health education. 7th Asian Conference on Sexuality Education (18-19 October). Hong Kong Family Planning Association, Hong Kong.
25. Onwuezobe, I. A., & Ekanem E. E. (2009). The attitude of teachers towards sexuality education in populous local government area in Lagos, Nigeria. Pakistan Journal of Medical Science, 25(6), 934-937.
26. Oshi, D. C., Nakalema, S., & Oshi, L. L. (2004). Cultural and social aspects of HIV/AIDS education in secondary schools in Nigeria. Journal of Biosocial Science, 37(2), 175-183. https://doi.org/10.10 17/S0021932004006820
27. Pokharel, S., Kulczycki, A., & Shakya, S. (2006). School-based sexuality education in Western Nepal. Reproductive Health Matters, 14(28), 156-161.
28. UNESCO. (2009). International Guidelines on Sexuality Education: An evidence informed approach to effective sex, relationships and HIV/STI education. UNESCO. https://www.refworld.org/docid/4a69b8902.html
29. Unis, B. D., & Sällstrӧm, C. (2020). Adolescents’ conceptions of learning and education about sex and relationships. American Journal Sexuality Education, 15(1), 25-52. https://doi.org/ 10.1080/15546 128.2019.1617816
30. Weaver, H., Smith, G., & Kippax, S. (2005). School-based sex education policies and indicators of sexual health among young people: A comparison of the Netherlands, France, Australia and the United States. Sex Education, 5(2), 171-188. https://doi.org/10.1080/ 1468181 0500038889