This paper aims to provide a clinical and nosographic framework for sex addiction (Compulsive Sexual Behaviour Disorder, CSBD) and chemsex, examining their neurobiological similarities, clinical differences, and therapeutic implications. Sex addiction – coded in ICD-11 as CSBD (6C72) under impulse control disorders, but absent from DSM-5 – is characterised by compulsive and recurrent sexual behaviours causing clinically significant distress and functional impairment. Chemsex, by contrast, constitutes a structured practice in which specific psychoactive substances (methamphetamine, GHB/GBL, mephedrone) are intentionally used to amplify and prolong the sexual experience, predominantly among men who have sex with men (MSM). Both conditions share a common neurobiological substrate – hyperactivation of the mesolimbic dopaminergic reward circuit – but differ in clinical complexity, at-risk populations, risk profiles, and therapeutic approaches. Chemsex introduces a critical additional dimension: a dual craving (sexual and substance-related) alongside physical dependence on GHB/GBL, rendering treatment considerably more complex. Diagnostic criteria, psychiatric comorbidities, evidence-based therapeutic approaches, and the specific clinical challenges of each condition are discussed.
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