Background: sexual abuse as including any of the following acts committed by an adult orrnunder: attempted or completed sexual intercourse (i.e., oral, anal, vaginal); touching, kissing, orrnrubbing up ; exhibiting their body parts ; or having the view any type of sex actrnObjective: To determine the magnitude, contributing factors and the health consequence of sexualrnabuse among male high school students Addis Ababa city administration .rnMethodology: A cross-sectional descriptive study involving 884 randomly selected studentsrnamong 9 Addis Ababa high schools was conducted in March 2009. Pre-tested questionnaire wasrnused to collect data, which was entered and cleaned using EPI version 6 statistical packages andrnanalysis of data was done using SPSS for windows, odds ratio with 95% confidence interval wasrnmade, and for independent variables that have borderline association with the dependent variablernentered to a model to look for confounding effect.rnResults: As this study indicates, sexual abuse of boy students in Addis Ababa is common with arnlife time prevalence of rape and sexual harassment of 4.3%, and 68.2%, respectively. The chancernof experiencing sexual coercion was higher among students who live alone (AOR = 2.87; 95% CI;rn1.07, 7.66) and among students who live with others (AOR =1.80; 95% CI = 1.04, 3.11) thanrnstudents living with both. Similarly, the odds of experiencing rape in their life time was higherrnamong students who live with others (Adj OR=2.20; 95% CI; 1.04, 4.68) than those who live withrntheir biological parents.rnConclusion and recommendation: Sexual abuse of boys is associated with those living alone orrnliving out side their parents. Considering these findings, providing information, education andrncounseling service of students living outside their real biological parents is important.