Acceptance and Commitment Therapy for Chemsex

Inclusion Criteria: * Male * age 18-65 * access to internet capable smart device * documentation of Alabama residence * access to a private area to attend tele ACT-for-chemsex sessions * self-reported chemsex within six-months of intake * English fluency. Exclusion Criteria: * Psychotic disorder * bipolar disorder * eating disorder * major neurocognitive disorder diagnosis * self-harm or suicide attempt within 12 months of screener * suicide plan/intention at time of screening * ongoing treatment for a complex medical comorbidity (e.g., in patient cancer treatment) * current enrollment in an individual ACT-based psychotherapy intervention.