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This is Dr. David
many years of diabetes can cause damage to nerves and cause loss of erections.
do you have type 2 diabetes? this comes from being overweight.
are you overweight?
you have to loose weight with diet and exercise to reverse diabetes to help your erections.
has your doctor talked to you about stomach bipass surgery or barriatric surgery to help you loose weight?
Thanks for this question
You need to see a urologist and get the nerves and arteries supplying the penis with blood and sensation tested
also prostate examination
get all of that checked