ABSTRACT The PROBIOPS project is a six-wave, two-sample, large-scale longitudinal study of the associations between pornography use in adolescence and a variety of sexuality-related outcomes. It was conducted over three years (2015–2018) using school-based and online surveying among high school students from Croatia aged 15–16 years at the study onset. This review aims to overview and critically evaluate methodological aspects of the study and its main findings. Methodologically, major improvements compared to previous longitudinal research on the topic are presented, as well as major study limitations. Longitudinal findings on the outcomes of pornography use presented in 24 peer-reviewed papers published between 2018 and 2021 were summarized under the following four domains: sexual risk-taking, sexual violence, psychological and sexual well-being, sexuality-related attitudes. Several papers addressing other topics (e.g. pornography use and religiosity, parental monitoring, and testosterone levels) were presented separately. While the results vary considerably by topic, gender, type of effects found, and effect size, the overall findings suggest that pornography use presents no major negative, or positive, factor in the sexual socialization and sexual lives of most adolescents. Recommendations for future longitudinal research on adolescent use of sexual media are proposed based on lessons learned from the PROBIOPS project.
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