The main purpose of this article is presentation of several basic issues related to the phenomenon of child sexual molesters and recognition of pedophilia as a significant social problem. The article, supplemented by casuistic illustration showing adolescents with sexual behavior disorders is giving rise to the following question: do they progress in their inappropriate behaviors to grow into adult molesters or do they stop anywhere along the way of their development? Casuistry, in the intention of the authors, is the background for discussion about prevention of child sexual abuse. This article presents also a review of the current knowledge about child sexual molesters. The topics include: the definition of pedophilia itself, which varies in the literature depending on the types of activities, kinds of victims and the circumstances in which the perpetrator acts, through to the recognition of symptoms of pedophilia as well as its consequences. It includes both intra-familial and extra-familial child sexual abuse and their offenders. The more, that the history of child sexual abuse is associated with numerous long-term physical, psychological, behavioral, interpersonal and social effects on the victim. The examinations made among pedophilic molesters have shown structural and functional temporal-limbic abnormalities, including abnormalities in the amygdala and it is possible that the pedophilic inclinations are secondary to neurodevelopmental perturbations and other neuropsychiatric syndromes.