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Possible underlying causes of a bent penis include: 1  Normal differences in penis anatomy. 2  Autoimmune disorder. 3  Inherited fibrous tissue (collagen) abnormality.  Injury to the 1  penis. Peyronie's disease (a curved erection caused by one of a number of underlying conditions)
Diabetes mellitus also causes erectile dysfunction by damaging nerves that go to the penis, much like the effect of diabetes on nerves in other areas of the body (diabetic neuropathy). Diabetes can also affect the muscles in the penis, leading to troubles with erections.