SPECT scan of a porn addict's brain:
Long-term addiction to PMO:
Downregulates neurotransmitters (e.g., dopamine and serotonin) - 1, 2, 3, 4
Disrupts hormonal balance (e.g., testosterone, prolactin and adrenaline) - 1, 2, 3, 4, 5, 6, 7, 8
Decreases the volume of grey matter in the brain...