The relation of masculinity - femininity stereotypes depending on sex and ethno demographic characteristics in adolescents and their "I-image" is studied. 289 VIIth- and Xth-graders were examined. The notion of "Majority of Men", "Majority of Women", "I" were evaluated by participants according to "Personality potential" methodics and the results were factorized for three groups; boys, girls and adolescents living in the same district. The differences of stereotypes were due to sex and ethno democratic characteristics of participant and to the notion considered. The instrumentality prevailed in masculinity stereotypes and stereotype perception in boys and the emotionality prevailed in femininity stereotypes and stereotype perception in girls. The peculiarities of "I-image" depending on sex and the degree of sex-role liberty in different ethno demographic situations are described.