Today premarital intercourse is becoming common among adolescents because of manyrnfactors such as decline in the age of puberty and delaying marriage. In addition, this earlyrnsexual in;(;a(;ol1 C((11 he alfrilmted to many factors such as family relaled variables, peerrnpressure and perceived peer group sexual activity. Provision of information and guidancernon sexuality for adolescents is low or non-existent. Consequently, adolescents can makernuninformed sexual decisions resulting in risks like HIVIAIDS and unplanned pregnancy.rnHence, this s(lIdy was in(ended to assess family, peers and school clubs as predictors ofrnsexual behavior and risk perception of high school adolescents of two selected townsrn(Adama and Shashamanne) from each of which 2 schools were randomly selec(ed. US'ingrnstratification 360 participants, 184 males and 176 females, were selected. To collect thernnecessary data, close-ended questionnaire whose validity and reliability were tesled usingrntest-retest method and semi-structured FGDs were employed. The study indicated thatrnnearly one-thirds of the respondents were sexually active. Males and older adolescentsrnaccountedfor the higher proportion of the sexually active adolescents. Most of them neverrnor inconsistently used condom during the first intercourse and during intercourse withrntheir regular partners. Risky sexual behavior was associated with single parenting and lowrneconomic background for girls than for the boys. Adolescent-family communication onrnsexual mailers was found to be uncommon. Participation in clubs and parental educationrnhad significant correlation with risky sexual behaviors. Though peers were reported as thernmajor S01!rce (?( il?(ormation. the relationships hetween risky hehavior and peerrncommunication was not significant. Therefore, the problem investigated in the study shouldrnbe intervened thou~h establishing adolescent health policy and provision of awareness andrnpractical skills on sexual issues