Sexuality in the ecological model is a human attribute, the undifferentiated driving force of complex conditionings, which finds its vent in the forms shaped by the system in which humans operate. Sexual identity is a basic sense of what the male and female sex are and is linked with the conviction of one’s masculinity or femininity. This identity is frequently clearly marked towards the second year of life, and approximately from the age of four it does not undergo any considerable changes. However, from the psychological point of view the process of sexual identity formation is a part of the process of child’s separationindividualisation. The aim of this paper is to bring closer to the Reader the concept of the psycho-sexual d...