The current research has been conducted with the aim of identifying the bases, causes and consequences of these abnormalities among teenagers with an emphasis on secondary school girls.

The current study was conducted using a qualitative method based on the grounded theory method. In order to identify hidden sexual relations, using the purposeful sampling method and the combined strategies of theoretical and snowball sampling, interviews were conducted with 30 female secondary school students of one of the high schools in Shazand city as a study sample, and after coding and categorizing, drawing a model Paradigmatic bases, causal factors, intervenors and consequences of these abnormal hidden sexual relations have been analyzed.

The hidden illicit sexual relations identified among female students include: the phenomenon of extramarital relations, the phenomenon of premarital sex, and the phenomenon of sexual sadism and masochism. Based on the data collected from sample people in open coding and axial coding, in general, 10 categories were obtained for background conditions, 9 causal conditions, 7 interfering conditions, and 10 categories for consequences. For each phenomenon, a paradigm model in 4 sections was obtained based on the categories. which include causal conditions, contexts and contexts, intervening conditions and consequences are presented.

The study of hidden abnormal sexual relations showed that the existence of these deviations has spread significantly and there is a need to seriously plan in the field of sexual socialization and parents' relations with girls. Neglecting and covering up these deviations under the pretext of their being taboo will not help other than to increase the depth of the consequences of these deviations.