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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)
PENIS AND SEX. Flaccid penis after ejaculation. Flaccidity after ejaculation (refractory period) is caused by the hormone oxytocin. The amount oxytocin increased may affect the length of each refractory period.