This assignment is an exploratory quantitative study of links between the gender composition of contexts (mainly school context) in which young people aged 12-18 stay, taking into account family characteristics, SES, origin, and on the other hand their relational, sexual and gender perception and the relational, sexual and gender experiences. This is based on analyzes of data from existing scientific data sources that can be consulted by the contractor. These are scientific data that are not the property of the client.