Psychological Effects of Methylenedioxymethamphetamine (MDMA) When Administered to Healthy Volunteers

The goal of this clinical trial is to study MDMA-assisted therapy in healthy volunteers. The main question it aims to answer is: Do two sessions of MDMA-assisted therapy result in changes in mood, emotional closeness to self and others, and other psychological symptoms? Researchers will compare MDMA-assisted therapy to placebo with therapy. Participants will have a non-drug preparatory session prior to each experimental session and an integrative session after each experimental session. Participants who received MDMA will crossover to receive placebo and placebo participants will crossover to receive MDMA.