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A man's most important sex organ is his brain.

Our brains crave novelty, and the Internet provides an endless variety of novel sexual images. When I was a young man looking at magazine centerfolds, images lost their appeal within a short amount of time. But with online porn, new images are instantly available with the click of a mouse. With each new image, our limbic system releases a burst of dopamine, which tells us we gotta have it.

The connection between novelty and sexual arousal is well established by what scientists call the Coolidge effect. After dropping a male rat into a cage with a receptive female, researchers initially observed intense copulation between the rats. Eventually, the male rat exhausted himself; even when the willing female rat wanted more, he was spent.

Guess what happened next? When the original female was replaced with a new receptive female, the male rat immediately revived and began to copulate again. This pattern was repeated over and over until the male rat was literally exhausted. With the introduction of a novel sexual mate, this process will be repeated again and again until the male succumbs to exhaustion or death.

In the real world, even Hugh Hefner didn't enjoy an endless supply of women to revive his sexual capacities at any given time. But in the unreal world of online porn, new and ever more stimulating "mates" provide complete novelty without ever needing to step away from the computer.

As long as the novelty continues, the arousal continues - while dopamine fuels the desire engine. One man I recently spoke with averaged six hours a day viewing porn. In his case, every click on a new image released more dopamine, which inflamed his desire. You can see that a vicious cycle is set in place.

Tolerance occurs when a person needs more of the substance or activity to get the same effect. Over time, we grow increasingly tolerant to certain stimulants. With drugs and food, tolerance typically means eating or imbibing more frequently or consuming larger amounts. With internet porn, a man can overcome the tolerance effect two ways: he can increase the amount by spending more time viewing porn, or he can overcome his tolerance by escalating the intensity of the images he sees.

It's for this reason that men often move from the Sports Illustrated swimsuit issue to soft porn, from soft porn to hardcore porn, and finally from hardcore porn to degradation, bestiality, rape, or other scenes typically deemed repulsive and shocking. They do this not because they are predisposed to it, but because the strong emotions of shock, disgust, or shame provide the sought-after dopamine burst. Gravitating toward aberrant sexual behavior becomes the only way to get a fix.

Unlike substances that require the user to arrange for a fix, a man carries a forever stash of porn in his mind without even turning on the computer. Every time the images come to mind, he experiences a burst of dopamine in his neuropathways. Not to mention most of us have instant access to online porn right in our pockets, just one right-swipe away.

Cravings occur when dopamine (the "I want it" neurotransmitter) is released. When more dopamine is released, a person experiences cravings.

Cravings usually lead to viewing more porn. Viewing more porn leads to more dopamine being released. More dopamine leads to viewing more porn.

You get the picture - it's a potentially never-ending cycle.

In the center of the limbic system—the center of our urges and desires—there is a reward circuit flowing to the cerebral cortex—the rational part of the brain.

Ideally, this circuit works in harmony. When the limbic system urges you to have another piece of chocolate cake, the cerebral cortex reminds you that you can't fit into your jeans, so you say, "No, thanks."

In the case of a man whose brain is not yet addicted to porn, his limbic system may urge him to Google the words "naked women," but his cerebral cortex reminds him that his wife or girlfriend may not think highly of such an act.

Porn, however, throws the reward circuit off balance. Rather than complete the circuit in harmony, porn trips the circuit breaker, and disharmony occurs between the two systems.

When the "go for it" system is overloaded with excess dopamine, the "think about it" system responds by saying, "System overload!" and shuts down. Suddenly, rational thought is usurped by limbic impulse.

Across the synapse—the micro space between neurons—reward cells talk to one another through dopamine signaling. Dopamine, remember, is the message, and the receptors on the receiving nerve cells are the ears. When dopamine is released in large amounts or for long periods, two things happen simultaneously. First, the receiving nerve cells get overstimulated and start removing receptors. It's like when someone keeps shouting at you; you cover your ears. But the sending cells scream even louder (more dopamine) until they are hoarse, and can now only whisper (amount of dopamine sent is below normal). With the receiving cells half-deaf (fewer receptors) and the sending cells whispering (less dopamine released), you are left with two options: feeling awful, or finding porn, the one thing that now releases dopamine more than anything else. Low dopamine signaling leads to a numbed pleasure response and is known as desensitization. What this leads to is increased craving alongside decreased ability to experience satisfaction. It is precisely why men feel so helpless, so powerless, when they try to overcome their sexual addiction.

Addicts are always hungry, but never full.

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