In diabetics, impotence that develops acutely in the setting of hyperglycemia and poor metabolic control is usually reversible. This is not true of the slowly progressive impotence of long-standing diabetes that is a manifestation of autonomic neuropathy. Intracavernosal self-injection of vasoactive drugs such as papaverine, which relaxes arteriolar smooth muscle is a promising new approach to treatment that is particularly suited for diabetic patients whose erectile dysfunction is on a neuropathic basis. It also has been used with success in spinal cord patients.
Trauma to the pelvic blood vessels or nerves can also lead result in ED. Bicycle riding for long periods has been implicated as an etiologic factor; direct compression of the perineum by the bicycle seat may cause vascular and nerve injury.  On the other hand, bicycling for less than 3 hours per week may be somewhat protective against ED.  Some of the newer bicycle seats have been designed to diminish pressure on the perineum. [37, 38]
Men, if you can't get an erection and are in a relationship with someone you deeply care about... Please.. Bring on the toys.. bring on the hands.... bring on the tounge.. do SOMETHING... Don't use that as an excuse not to erouse the woman you love. If shes not getting satisfied from you, she will find it somewhere else OR... she will be sad stuck in a relationship STARVING for sex and have pity on you. You can do so much without an erection. That's not the end all be all in orgasms for women. Trust me... You need to over compensate for problem. You can actually appear MORE manly by stepping up and making sure woman is satisfied. Don't let your bed be a graveyard.!!! I am pretty sure you can still have an orgasm without an erection.. if you have the right woman,... pleasure her. Do what it takes to help her orgasm... and then it's your turn. She will make sure you are pleased regardless if you are fully erected or squishy... Don't fret over this.. Seriously...!!! Don't feel like your manhood is any less... Rise up and serve and she will make you happy. Trust me!!
Long-term predictions based on an aging population and an increase in risk factors (eg, hypertension, diabetes, vascular disease, pelvic and prostate surgery, benign prostatic hyperplasia, and lower urinary tract symptoms) suggest a large increase in the number of men with ED. In addition, the prevalence of ED is underestimated because physicians frequently do not question their patients about this disorder.
The link between chronic disease and ED is most striking for diabetes. Men who have diabetes are two to three times more likely to have erectile dysfunction than men who do not have diabetes. Among men with erectile dysfunction, those with diabetes may experience the problem as much as 10 to 15 years earlier than men without diabetes. Yet evidence shows that good blood sugar control can minimize this risk. Other conditions that may cause ED include cardiovascular disease, atherosclerosis (hardening of the arteries), kidney disease, and multiple sclerosis. These illnesses can impair blood flow or nerve impulses throughout the body.