The aim of the present investigations was to answer the questions of (a) whether and in the sphere of what family factors there are differences between secondary school girls using and not using Internet pornography and (b) whether and what kind of relations obtain between the dimensions of Internet addiction and family factors in a group of girls using Internet pornography. Material: The participants were 186 secondary school girls aged 16-19 years. Methods: The study was conducted using Young's Internet Addiction Test (IAT) for assessing the severity of Internet addiction, and the following instruments by Pawlowska and Potembska: the Internet Addiction Assessment Questionnaire, the Disturbed Family Relations Questionnaire, and a Personal Inquiry Form. The Internet Addiction Assessment Questionnaire consisted of five scales, I. Acceptance, II. Games-Need for Aggression and Power, III. Computer Addiction, IV. Internet Addiction, and V. Pornography. The Disturbed Family Relations Questionnaire was made up of scales for I. Violence, II. Overprotectiveness, III. Coalition with the Mother, IV. Lack of Acceptance-Rejection, and V. Indifference. Results and conclusions: On the basis of the obtained results, the following conclusions were formulated: 1. The girls who used Internet pornography, more often than the girls who did not use it, had experienced violence and rejection in the family, and had taken over the role of guardians in their relationships with their mothers. 2. Increased symptoms of addiction to the Internet, aggressive computer games, and Internet pornography, as well as the search for acceptance and understanding from people contacted online co-occured with violence, rejection, and indifference experienced in the family, assumption by the child of the role of guardian and protector of the mother, and fear of adulthood.