This study aims at understanding the motivations of adolescent Internet use and the influence of their exposure to pomography in cyberspace. A field survey was administered to 2400 9-12th grade students. the Main findings of the study are as follows: a. The more adolescents use the Internet, the more frequently they are likely to expose themselves to pomography in cyberspace, b. Exposure to pomography has statistically significant influence on the adolescents` attitude and behavior in cyberspace, c. Motivations driving Internet use have a statistically significant influence on adolescents exposure to pomography in the cyberspace, d. Motivations of the Internet use have statistically significant relations with adolescents delinquency in cyberspace. Besides, this study also discusses implications of the research findings regarding promotion of information welfare for adolescents.