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Interesting survey! You should make yourself a wiki on Everipedia.
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The role of the brain
It is necessary to understand how the brain works to be able to understand why watching excessive amounts of porn can lead to ED.

Neurons are cells that receive and send messages between the body and the brain. The brain has about 100 billion neurons, which are the basic working units of the nervous system.

Neurotransmitters send chemical messages between the neurons. A neurotransmitter called dopamine helps the flow of information to the front of the brain, which is linked to thought and emotion. It is also linked to reward systems.

Brain cells are activated by what people see or hear. If a person receives a hug, the brain releases dopamine, which makes the person feel good. A person's response to natural rewards such as sex are largely regulated by the dopamine pathway as well.

Erections are dependent on the activation of this pathway. Dopamine signaling plays a crucial role in sexual arousal and erections.

Dopamine overload
When a person watches porn, their brain is flooded with dopamine. Too much dopamine can cause problems. The brain is overwhelmed by the overload of chemicals, and it automatically takes away some of the dopamine receptors.

Although the brain continues to release the same levels of dopamine in response to porn, eventually there are fewer receptors to receive the messages. Watching porn no longer arouses the person as much or as quickly. They then have to look at more porn or search for stronger porn to obtain the original sensation.

Sexual activities that would normally give people a burst of dopamine and make them happy are no longer enough to sustain them. They constantly have to look at porn to get the sensation they need, and this can lead to ED.

Many men find themselves unable to maintain an erection in the absence of porn. The internet and other avenues provide an unlimited amount of content, so some men begin to watch massive amounts of porn to maintain high levels of sexual arousal.
A person's overall lifestyle also can play a role in the development of ED. Smoking, drinking too much alcohol, using illegal drugs, being overweight, and a lack of physical exercise can all be causes. ED is also a side effect of some common medications.
Men who have erectile dysfunction are unable to get or keep an erection long enough to engage in sexual intercourse.
An erection normally occurs when blood flow increases into the penis, causing it to expand and become firm.

Erectile dysfunction symptoms might include:

trouble getting an erection
trouble keeping an erection
reduced sexual desire
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