Actually, the most frequent cause of the scarring that leads to a curved penis is circumcision
. Despite the doctors that insist it's a very simple procedure, it's actually very easy to screw up
. Guys end up with curves (which I also agree is not a problem; one of my boyfirends had a downward curve. His current wife is very happy), little scraps of hanging foreskin
, and occasionally even have to get reconstructive surgery or are turned into girls.
And for what? There's actually no good reason to do it unless you're Jewish.