There are a lot of explanations for these high ED rates, some of which are psychological. “A lot of men may have an off night, and then that sticks in their head and hurts their performance for a few weeks or months,” Dr. Köhler explains. He says anxiety stokes hormones like the fight-or-flight chemical adrenaline, which is a serious boner killer. (In evolutionary terms, it would be tough to run away from a predator with an erection.)
The penis is the male sex organ, and the shaft of it is the longest part. The glans and head are located at the end of the shaft. The opening at the tip of the head when semen and urine come out is termed the meatus. Inside the shaft are two cylinder-shaped chambers called the corpora cavernosa and they run the length of the penis. They have blood vessels, maze, open pockets, tissue, and others.

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From a medical perspective, your semen packs a pretty incredible punch. Within the 2 to 5ml of semen (AKA your ejaculate) that you yield every time you ejaculate, there contains around 20 million spermatozoa (your moving sperm), each roughly 50 millionths of a metre long. If you can’t picture this, just think back to your childhood when you stared at the tadpoles in your garden pond. That’s about the gist of it – except much, much smaller. Of course, your spermatozoa are not alone in your semen, having for company complex enzymes and fructose sugars that help your swimmers, well, swim and survive for longer.
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."
Fortunately, the harm free radicals cause can be prevented with antioxidant nutrients, notably vitamins A, C, and E, and the minerals, selenium and zinc. Antioxidant supplements can help, but nutritionists and public health officials agree that the best way to get antioxidants is from foods rich in them: fruits, vegetables, beans, and whole grains. That's why health officials urge at least five servings of fruits and vegetables every day. Many studies show that as fruit and vegetable consumption increases, risk of heart disease and every major cancer decreases. There have been no big studies of dietary antioxidants and sexual satisfaction, but the link is biologically irrefutable. As antioxidant intake increases, so does blood healthy flow around the body, including into the penis. If you smoke, quit. And eat at least five daily servings of fruits and vegetables—fruit with breakfast, a salad and/or vegetable at lunch and dinner, and snack on fruit.
A 2013 study published in The Journal of Sexual Medicine evaluated 439 men for erectile dysfunction and compared ED causes and frequency in men 40 or younger to men over 40. They found that 26 percent of the younger men had ED. Although these men were healthier and had higher levels of testosterone than the older men, they were more likely to be smokers or to have used illicit drugs. In almost half of the younger men with ED, the ED was considered severe.

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Additionally, financial struggles, issues at work, and issues at home with children or external family can impact the quality of sex you’re having. Remember that sex is a two person game. Both people need to be invested in it for it to be good. And good sex leads to longer, stronger, more powerful erections. It’s in both of your best interest to have better sex.

While the end product is the same, the journeys take three very different routes. The most common erection is your reflexogenic erection, caused by physical contact. The second is your psychogenic erection, caused by audiovisual arousal or imagination (but no contact). The third and final is your nocturnal erection that comes when you are in the deep REM stage of sleep – and which, in fact, has very little do to with sexual stimulation.
Lifestyle changes: One of the first things a young man can do to potentially improve or eliminate ED is make positive choices that will also have an impact on the rest of his life. Some changes a man can consider include increasing exercise, eating a heart-healthy diet, quitting smoking, and drinking alcohol only in moderation. Where a man has relationship problems, seeking counseling may also be helpful.
UW Health urologists with advanced training offer medical and surgical treatment options for men and their partners affected by erectile dysfunction. There are several different ways that erectile dysfunction can be treated. For some men, making a few healthy lifestyle changes may solve the problem. Your urologist will help determine the most effective course of treatment for your condition. 

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