Normally, all of the tissues of the penis are elastic and during erection, they expand equally in all directions. In men who have vigorous intercourse without a firm erection, the tissues can be injured. This injury causes minor bleeding into the tissues and results in scar formation. Initially, the scar is not as elastic as the normal tissues, so it does not elongate with an erection. This situation causes curvature. With time, scar tissue gradually matures and becomes more elastic. Therefore, Peyronie’s disease usually improves very gradually over several years. Often, though, it does not return to complete normalcy, but it can become much better. It is important to avoid repeated injury to the penis, taking care to have sufficient lubrication. To the extent that Viagra-like drugs create more rigid erections, their use is also helpful.