Failure to achieve an erection is not uncommon for most men and may be considered normal even if it happens as often as 20 percent of the time. There is a wide range of normal when it comes to sexual functioning and sexual relationships. "Generally if a couple feels comfortable with their sex life and they enjoy intimacy together, erectile dysfunction may not be much of an issue. But if erectile dysfunction is causing stress in a relationship, then help is available," says Feloney.
"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."
"Diseases and illnesses can hamper one's ability to achieve an erection," he explains. "Cancer, diabetes and heart disease is the cause in many cases. Low testosterone count caused by genetics, inactivity or unusual level of estrogen in the body can limit penile function as well." High blood pressure and high cholesterol can also be detrimental to erections.
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If this scenario sounds familiar, you're in good company. "In an ideal world, strong erections would come simply and naturally," says Caleb Backe, health and wellness expert at Maple Holistics. "However, due to a myriad of reasons, erectile dysfunction can set it at any given time or for a prolonged period of time for a large part of the male population. It is estimated that as many as 30 million men in the United States alone suffer from ED."
The third tip for how to keep an erection longer is to frequently switch positions during sex. You’ll like some positions, but hate others. Keep mixing it up. Return to the ones you like every so often, but spend just as much or even more time in the positions you don’t like. As long as the positions aren’t painful for either you or your partner, doing this will lengthen your erection.
Did you know that a cock ring can help you maintain an erection? This O-shaped toy fits around your penis and helps keep blood in the shaft, where you want it. A cock ring also helps prevent venous leakage, a form of erectile dysfunction where blood flows to your penis, but has trouble staying there. (Giddy, a new cock-ring-like gadget designed to treat ED, may also help guys with venous leakage maintain stronger erections.)
The good news? That same study found that men were significantly less likely to have erectile dysfunction if they worked out regularly, maintained a healthy weight, avoided tobacco, and kept their alcohol intake to a minimum (two drinks a day, if you drink booze at all, should be your limit). So don't accept erectile dysfunction as an inevitable downside of aging. Talk to your doctor if you're having problems getting or sustaining erections.
"It definitely was a blow to my masculinity," Francis told Mic. "It didn't help that my wife at the time would say that I must be gay if I couldn't keep it up for her." Compounding the issue, if an erection doesn't happen during a given sexual encounter, the man can obsess over it, inevitably creating pressure and making it difficult for him to become fully aroused during future encounters. 
As the nervous system of autonomic response, the erection can result in different stimuli that include the sexual arousal and stimulation which is not even under the control of the conscious mind. The absence of the nocturnal erection is also used commonly for distinguishing between the psychological and physical cause of impotence and erectile dysfunction.
Men with a healthy lifestyle and no chronic disease had the lowest risk for erectile dysfunction; the greatest difference was seen for men aged 65-79. For instance, men who exercised at least three hours per week had a 30% lower risk for ED than those who exercised little. Obesity, smoking, and excessive TV watching were also associated with having a greater risk of erectile dysfunction.
Regular exercise for about 20 to 30 minutes a day may act as a libido enhancer and certainly will improve your overall health. "Exercising improves blood flow to all areas of your body and that includes the pelvic region where the blood vessels needed for sexual functioning are located," says Feloney. Some other ways that regular exercise can improve your sexual performance include building up your stamina, lowering your blood pressure, relieving stress, and helping you look and feel better.

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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