As we continue "The 20 Truths Series," we explore the reality that there is a physiological aspect to all addiction. We get addicted to things that at first are very pleasurable. The hormone released in the brain that causes us to feel pleasure can be quite intense, but diminishes in intensity over time. So we keep repeating the behavior, seeking the high, but with diminishing return. This is the nature of addiction. Steve Gallagher teaches us that Behind Sexual Addiction Lies the Pleasure Hormone.