Be careful.....you can actually "fracture" your penis. Even though there are no bones in the penis...they still call it a fracture. Went on an ambulance call one time where a guy tried to "straighten" his bent penis and he fractured it.....he was in a lot of pain. What happens is you actually rupture one of the vascular spaces that fill with blood to cause an erection.
If your penis has always bent a little to one side, I wouldn't worry about it. In fact, most penises aren't broomstick- straight.
If this is a recent occurrence, it might be due to an injury you incurred that caused some scar tissue, or "plaque" buildup on one side of your penis. When you get an erection, the scar tissue isn't as stretchy so you get a bend, just like one of those bi-metallic strips used in some thermostats. This is known as Peyronie's disease. Sometimes it will go away on its own, sometimes corrective surgery is required. Get thee to a search engine and look it up, you'll probably find all sorts of info.