In a secretive group chat, Brazilian gay men gather for a taboo urethral sounding session. The host, from Brasilsounding, sends an invite to the private WhatsApp group, sparking anticipation. One by one, they take turns pushing metal sounds into their red, sensitive urethras, groaning in a mix of pain and intense pleasure. The room fills with the clinking of metal and wet, sucking sounds as they push their limits, exploring the edge of CBT.