Title: Chemsex use among MSM in Verona: prevalence study among HIV/STIs clinic attendees at high risk for HIV/STIs.

Primary objective: assessing the local prevalence and the epidemiological characteristics of chemsex use amongst MSM who attends the two HIV/STIs screening facilities in Verona.

Secondary objectives:

• Evaluating the socio-demographic characteristics of chemsex users.

• Evaluating the risk factors related to the use of chems before/during sex.

• Evaluating the STIs prevalence among chemsex users vs non-chemsex users.