The "Am I Normal?" study examined more than 15,000 men in the UK. The average erect penis was 5.16 inches (13.1cm), while the average flaccid penis was 3.61 inches (9.2cm). But maybe take this with a pinch of salt – the "study limitations" section of the research paper states “relatively few erect measurements were made in a clinical setting and the greatest variability between studies were seen in the flaccid stretched length”. Yes, how hard is too hard to yank for a study?
As recently as two decades ago, doctors tended to blame erectile dysfunction on psychological problems or, with older men, on the normal aging process. Today, the pendulum of medical opinion has swung away from both notions. While arousal takes longer as a man ages, chronic erectile dysfunction warrants medical attention. Moreover, the difficulty is often not psychological in origin. Today, urologists believe that physical factors underlie the majority of cases of persistent erectile dysfunction in men over age 50.
There are many factors that can lead to ED. “Psychological causes of erectile dysfunction in young men can include performance anxiety, guilt about sex in general, guilt about having sex with a particular partner, feelings of anger or resentment towards a partner, or simply finding a partner undesirable,” said Carole Lieberman, MD, a psychiatrist on the clinical faculty of the UCLA Neuropsychiatric Institute in Los Angeles.

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So not only are erectile problems common, they're nothing for you or your special friend to be freaked out about. Check out the nine most common reasons that dudes sometimes can't get it up, and get ready to become the soothing voice of reason the next time the guy you're with has a hard time pitching his tent in your happy valley. Everything (and every penis) is gonna be fine!

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.

Remember those cultural messages we discussed earlier, about how men are wild sex aliens from the planet Weenus? Well, men are raised hearing those messages, too, and they can end up screwing with their sexual self-image —for instance, they can lead men to obsess over their own virility, and panic about impressing a new partner, until they've thought their boner into a corner and can't get an erection. Performance anxiety is one of the most common culprits behind lost erections, especially among younger, less experienced men.

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Regular exercise and a diet rich in antioxidants is also the foundation of permanent weight control and diabetes prevention. Studies at the Duke University Diet and Fitness Center show that weight loss is strongly associated with better sexual function. Other studies show that diabetes is a major risk factor for ED, and that a healthy lifestyle prevents the disease and can restore erection function.
It’s important not to take a bout of psychological ED personally. Still, when confronting a suddenly soft penis in the moment, “It’s not you” can be hard to believe. For instance, Erin, 22, tried—really tried—to make sex with Drew* happen. The first time his erection died right before they were about to have sex, she improvised and gave him “really long” oral instead. But the lack of a boner was confusing. “That had never happened to me with a sexual partner, so I was like, ‘Okay, he’s just not into me,’” Erin recalls.

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