subject: Etymology -Penis- [print this page] Curvature: few penises are completely straight, with curves commonly seen in all directions (up, down, left, right). Sometimes the curve is very prominent but it rarely inhibits sexual intercourse. Curvature as great as 30 is considered normal and medical treatment is rarely considered unless the angle exceeds 45. Changes to the curvature of a penis may be caused by Peyronie's disease.
