PreVist is a project created and implemented by the association Fleur de Pavé, a non-governmental organisation engaged in sex work risks minimisation in the canton of Vaud (Switzerland). Based on research on the victimisation and stigmatisation of sex workers and situational crime prevention strategies, this project aims to reduce the victimisation of sex workers. We conducted workshops with indoors and outdoors sex workers and their clients. Three types of workshops were developed for the sex workers: “crime prevention and victim’s rights,” “what makes a good client” and “the need to be supportive and united”. As an additional measure, pocket alarms were distributed. To motivate prosocial behaviour, we developed a guide for clients which was distributed on the streets and in the erotic massage salons. We hope that this project could inspire other organisations to carry out prevention projects in this field. At this stage, the limitations of this project are: a) the lack of systematic and rigorous experimental evaluation of the efficacity of the project, b) the limited room for manoeuvre of an association, and c) the risk of encouraging undocumented migrants to report crimes. To overcome these limitations, we suggest collaboration between academia and NGOs for the design, implementation and evaluation of such programs.