Hypospadias is one of the most common birth defects, affecting 1 in 200 boys. In this condition, the urethra (which is the tube through which urine leaves the body) opens on the underside of the penis instead of at its tip. Very often there is also a curvature or a downward bend of the penis which becomes more pronounced when the penis is erect. This curvature is called chordee. Sometimes, the penis appears to be rotated to one side resulting in what is called torsion. Torsion and chordee can occur without hypospadias too.