Sexting is broadly understood as a set of behaviours that include sending, receiving, forwarding, and posting sexually explicit or suggestive content such as photographs, videos, and messages via electronic devices. Due to the lack of longitudinal studies, this review aims to bridge the gap in the current literature by reviewing sexting research with a longitudinal study design among youths. A narrative review of the quantitative data was conducted in accordance with the PRISMA guidelines. Five databases were searched, and eighteen peer-reviewed articles that met the inclusion criteria were identified. The results were categorised into five categories: (1) relationship between sexting and sexual behaviour, (2) relationship between sexting and psychological well-being, (3) relationship between sexting and violence, (4) relationship between sexting and personality, and (5) relationship between sexting and social factors. Due to the different objectives and measured variables, it is difficult to compare the results of the reviewed longitudinal studies. Longitudinal data on the temporal aspects of sexting involvement would be beneficial for building interventions and prevention frameworks to reduce non-consensual sexting.