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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)
Some other causes of male infertility include: 1  Illicit drug use. Anabolic steroids taken to stimulate muscle strength and growth can cause the testicles to shrink and sperm production to decrease. Use of cocaine or marijuana may temporarily reduce the number and quality of your sperm as well.  Alcohol use.