"This triggers the release of a neurotransmitter called dopamine, and it sends a chemical message from the brain to the penis, causing an increase of blood flow to the penis. The blood vessels leading to the reproductive system then relax and this allows increased circulation in the genital area. When you aren't aroused, the blood vessels in your penis are only partially open. But when your brain sends messages to your penis that you are ready for sex, the vessels open and allow more blood to enter the area. Because of the increased blood flow, blood gets trapped in the penis, which makes the penis expand and causes an erection."
While physical anatomy and chemical reaction are both important for getting and keeping an erection, the brain is one of the most vital parts of this puzzle. "An erection is controlled by multiple areas of your brain, including the hypothalamus, limbic system and cerebral cortex," notes Axe. "Stimulatory messages are sent to your spinal erection centers and this facilitates an erection. When there's an issue with your brain's ability to send these important messages, it can increase the smooth muscle tone in your penis and prevent the relaxation that is necessary to get an erection."
"This triggers the release of a neurotransmitter called dopamine, and it sends a chemical message from the brain to the penis, causing an increase of blood flow to the penis. The blood vessels leading to the reproductive system then relax and this allows increased circulation in the genital area. When you aren't aroused, the blood vessels in your penis are only partially open. But when your brain sends messages to your penis that you are ready for sex, the vessels open and allow more blood to enter the area. Because of the increased blood flow, blood gets trapped in the penis, which makes the penis expand and causes an erection."
The reversal of an erection is obviously necessary, but as Dr. Michael Reitano, physician in residence at Roman explains, this can be the impetus for weaker erections. "Usually there is a balance between the chemicals that result in the increased blood flow that results in a firm erection and the chemicals that allow blood to exit the penis and return it to being soft," he says. "That balance is precise and occurs in a sequence that allows an erection to last only as long as needed. However, in someone who experiences a softer erection, the balance of the chemicals that make the penis hard and the chemicals that return it to being soft is off. The scale is tilted."

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Now that he no longer has ED, Mher attributed the surgery to helping drastically improve his life. He told Mic that when he was dealing with the condition, most of his partners would eventually break up with him "because they couldn't understand" why he couldn't sustain an erection — a complaint that's common among younger men who struggle with erectile dysfunction. 
Watch whatever you eat: poor diet is also the reason for weak erections. As per the research, specific eating patterns cause heart attacks due to the restricted blood flow in coronary arteries which impede blood flow to the penis. Blood flow is also required for the penis to make it erect. Some of the diets also include vegetables and fruits that have fried, fatty and even processed foods that contributed to decreasing the blood circulation throughout the whole body. Anything which is terrible for man’s heart is also wrong for his penis and gaining an erection. One can learn how to keep an erection
It may be that after trialling all the above, including the little blue pills, you are still having challenges. There are always other options. The only issue is that they tend to move further away from science, proven efficacy and fact and more towards anecdotal evidence and illegitimate science, all while preying on a natural desperation to find a solution. I would say, if you are at this stage, go and see your doctor to discuss a referral to see a urology specialist. It may spare you dabbling, unsuccessfully, with the various less-proven methods, including:
Depression, anxiety, stress, insecurity, conflicted emotions, missing the last quarter of the basketball game, all can have an effect. If your man is a healthy dude, then his brain could be cockblocking your giving of "brains." As a man, it is a very defeating feeling and not something you just talk out with your penis. He has got to remain cool. If it happens, the faster he pushes it out of his brain the faster his subconscious will kick in his arousal. Try something like this: grab a glass of water, take a pee break and then just hang in bed together. Share laughs, talk about other things and let your companionship do the work. The less he is engaging his inner dialogue and the more he is engaging you, the faster his inner workings will settle and his libido will be back in action. That is, of course, if he really does want it to happen.
Alcohol: A couple of drinks can loosen your inhibitions and help you relax. But alcohol can also impair sexual functioning. Alcohol works on the nervous system by slowing down brain function, breathing, and pulse. Initially, the effect is often psychologically stimulating, since emotions and desires flow more freely. However, while alcohol may boost sexual desire by helping a person to relax, it can decrease performance, especially where erections are concerned. For this reason, it's best for guys to limit their alcohol intake to one to two drinks (or none at all) for optimal sexual function.

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"This triggers the release of a neurotransmitter called dopamine, and it sends a chemical message from the brain to the penis, causing an increase of blood flow to the penis. The blood vessels leading to the reproductive system then relax and this allows increased circulation in the genital area. When you aren't aroused, the blood vessels in your penis are only partially open. But when your brain sends messages to your penis that you are ready for sex, the vessels open and allow more blood to enter the area. Because of the increased blood flow, blood gets trapped in the penis, which makes the penis expand and causes an erection."
If you’re a guy over 40, there’s a fifty-fifty chance that you have a problem getting or keeping an erection. Now, I don’t mean the sort of erection you saw in American Pie! I mean an erection that’s firm enough and long-lasting enough for sexual satisfaction. Every guy has times when he just can’t manage an erection. Still, if you’re having trouble achieving a satisfying erection more than 50% of the time, you’ve got erectile dysfunction (ED).

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"Primarily because people tend to get anxious around introducing these things. Also, introducing these things too early can perpetuate a myth that it's low desire that is leading to the erectile issue. Low sexual desire is often not the cause of the problem. There can be other factors, such as depression, anxiety, poor self-image or esteem, etc. Without proper processing, adding sexual aids can add to a sense of shame if they don't work."
A very stressful or intense situation, or performance anxiety, could definitely make a man lose his erection. The pressure to perform could be psychologically too intense to keep a strong one. Another, lesser talked about erection killer is difficulty penetrating a partner during sex. It’s related to performance anxiety and stress, but also fatigue. If sex becomes tiring, fatigue will bring a quick end to an otherwise great night.
“Although having sex at 70 is not the same as having sex at 20, erectile dysfunction is not a normal part of aging,” according to Michael Feloney, MD, urologic surgeon and expert on sexual dysfunction issues at the Nebraska Medical Center in Omaha. “You should still be able to have a satisfying sex life as you age." If you are experiencing erectile dysfunction, these 10 dos and don'ts may help.

Irrespective of how stage one was achieved, the next part is all about your plumbing. Courtesy of your nervous system stimulus, a powerful blood vessel dilator, nitric oxide, is released into the trabecular arteries and smooth muscle in your penis. This causes the arteries and the main bulkhead of your penis, the corpora cavernosa, to become engorged with blood. Helpfully, to keep this blood in place and maintain your erection, the ischiocavernosus and bulbospongiosus muscles of your penis constrict, effectively blocking the veins of your penis from draining blood out.
The strength and frequency of your erection are an important indicator of your overall health. The blood vessels in the penis are smaller than arteries and veins in other parts of your body, so any problems like blockages, blood vessel dilation issues, or hormone imbalances will often show up as erectile dysfunction (or less firm erections) before something more serious like a heart attack or stroke.
Don’t approach sex like a race. If you struggle with losing your erection quickly, you might be used to speeding things up. That’s counterproductive, though. Work on slowing things down and don’t be afraid of what happens in your body. By slowing down, you’re retraining your body to expect something different from sex. Right now, your body probably expects to climax in a very short period of time. If that’s not what you want, you have to train your body to take a little longer. 

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Stiffy Solution: The good news is, almost all of these conditions can be successfully treated if you catch them early on. And since erectile problems may be the first side effect your dude has experienced, seeking medical treatment for his erectile problems may be the thing to get him into a doctor's office. So if your dude is a well-rested, non-drinking, non-smoking, paragon of relaxation who suddenly can't get wood, urge him to talk to his doctor — his misbehaving penis may actually be communicating something way more important than "Not tonight, honey."

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