Originally Posted by MacGuyver

This is really true in my p.o.v. because of muscle memory in your cock. If you use the right hand alot when you masturbate, I think that muscles on the left side of your shaft will be tighter from the pull of your fingers. Personally, I used to use either hand and I was straight as an arrow. Then I started using the right alot and developed alittle curvature to the left. It's why I think the theory is true. So to correct curvature, just use the opposite hand, I guess.