I was told that if you had a curve in your penis, it had nothing to do with it not sitting comfortable in your pants when you're having an erection, yet I read this:
A cross-section of the penis (left) displays the internal cavity that runs the length of the penis and is divided into two chambers (corpora cavernosa) by a vertical connecting tissue known as a septum. It is believed that, during trauma such as bending, bleeding might occur at a point of attachment of the septum to tissue lining the chamber wall (center). The bleeding results in a hard scar, which is characteristic of Peyronie’s disease. The scar reduces flexiblility on one side of the penis during erection, leading to curvative (right).
I had no idea. Whenever it hurts a bit down there during some random erection, I never give it any thought as I was told it was harmless.