The scar tissue prevents straightening of the penis, making the curvature most obvious during an erection. Normally, when the penis hardens and stretches, the skin and connective tissue of the penis remain loose and elastic to accommodate the changes. But the hardened scar tissue makes a normal straightening of the penis virtually impossible. The curvature may be so severe that it prevents penetration during intercourse.
Studies show that Peyronie’s disease can be found in up to 9 percent of men between the ages of 40 and 70. The incidence may be higher than that due to embarrassment and hesitancy to report the condition to doctors.