||In Malaysia, statistics from the National Registration Department (NRD) show that a total of 214,033 illegitimate children were born from 2004 to 2009. While statistics from the Royal Malaysia Police (RMP) show that 596 cases of baby abandonment were reported from 2005 to 2013. For the total number of rape crimes in among teenagers under the age of 18, PDRM statistics show an increase from 1,710 cases in 2006 to 2,658 cases in 2013. The increase in such cases shows that today's teenagers face the problem of moral decay and fragility of identity which is a concern of Malaysian society. Accordingly, knowledge of sexual and reproductive health can help adolescents avoid negative symptoms such as cases of extramarital pregnancies and social symptoms related to sexuality. The objective of this study was to (i). to study the prevalence of unhealthy sexual behavior among adolescents aged 13-24 years in peninsular Malaysia; (ii). identify risk factors related to adolescent sexual and reproductive health (ASRH); and (iii). identify protective factors related to ASRH. This study was implemented using two (2) main approaches, namely quantitative and qualitative methods. The design of the quantitative study was successfully conducted on 5,088 adolescents aged 13 to 24 years. The qualitative study involved a total of eight (8) Focus Group Discussions (FGD) conducted in eight (8) selected detention centers and shelter hostels located in several states in Peninsular Malaysia.