This article addresses sexting from its theoretical point of view and analyses the classification of its types and forms. Our focus is set to the motives for sexting among adolescents. The quantitative research carried out on the sample of 1,619 students in the Slovak Republic shows that adolescents can be divided into four groups according to their involvement in sexting: by-standers, victims, sexters and bidirectional sexters. It also shows that boys are involved in sexting more than girls. Semi-structured interviews with 37 adolescents aged 16-19 demonstrate that these adolescents encounter many forms of sexting such as partner's request for materials in question, requests from strangers, misused photos, blackmail, etc. The reasons for sexting include trust, relationship intimacy enhancement, distraction, effort to preserve friendship, etc. At-risk sexting stems from unawareness of consequences.