ED is caused by vascular, hormonal, neurogenic, pharmacological, or psycho-genic factors. Performance anxiety where the person fears failing in a sexual scenario is a common psychogenic cause for ED.3 Neurogenic causes are related to diseases like Alzheimer's, Parkinson's, stroke or spinal cord injuries. Radical removal of the prostate (also called prostatectomy) is the cause of nerve-related ED as nerve injury is possible despite advances in surgical methods.4

Peanuts contain a trove the amino acid L-arginine, which is one of the building blocks of nitric oxide, which aids your efforts under the covers. They also help reduce cholesterol levels. The less cholesterol you have in your system, the easier it is for blood to circulate throughout your body and down, which can help you maintain a firmer erection longer.
Personally, I think you are right. My husband had no problems with erectile dysfunction,until porn entered his life, and it was all downhill (way down), from there. When he finally quit porn, it actually took 2 yrs for my husband to completely regain function and be able to keep an erection. My husband is 59 yrs old, and I guess the older you are, the more difficult it is to regain function from Porn ED. Many people easily dismiss the idea that porn may be THEE problem. They shouldn't.
But you really do not need any medications like I-Arginine and others to solve your erection problems. Many researches suggest that if you try natural solutions and home remedies rather than going for medications, you will have a healthy and satisfying sex. These vitamins and supplements with surely  help in treating  your ED (erectile dysfunction) and other penis related problems.

Erectile dysfunction can occur for various reasons. A health condition, an emotional or relationship problem, a certain medication, smoking, drugs, and alcohol all have the potential to cause ED. Some people want a quick fix, so they rush to their doctor hoping to get medication, not knowing that there are natural home remedies for erectile dysfunction.
Size matters, so get slim and stay slim. A trim waistline is one good defense — a man with a 42-inch waist is 50% more likely to have ED than one with a 32-inch waist. Losing weight can help fight erectile dysfunction, so getting to a healthy weight and staying there is another good strategy for avoiding or fixing ED. Obesity raises risks for vascular disease and diabetes, two major causes of ED. And excess fat interferes with several hormones that may be part of the problem as well.
For many men, stopping smoking is an erectile dysfunction remedy, particularly when ED is the result of vascular disease, which occurs when blood supply to the penis becomes restricted because of blockage or narrowing of the arteries. Smoking and even smokeless tobacco can also cause the narrowing of important blood vessels and have the same negative impact. 
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