You can't. Just so you know, not very many penisses are absolutely straight, most of them are bent a little bit (or for some, a lot)
No real difference, but if its bent your more likely to be able to hit your partners g-spot alittle more then a straight one.
bent
They come in all different shapes and sizes and directions. They all get the job done. Some are basicly straight, some have an even curve to them and some have an angle. Up, down, sideways, it's normal for you and that's all that mattes. 3 inches can penetrate and inpregnate.
bent backward
bent.
Sure.
No, it is not a problem.
A cork-screw bull is a bull with a cork-screw penis. A bull with this defect cannot breed females because the penis is not straight enough to be able to enter a cow's or heifer's vagina to breed her. The penis is, in a way, bent, but it is more shaped like a cork-screw than anything.
if you dick isn't straight, can it be straight? if you dick isn't straight, can it be straight?
The opposite is straight.
bent backward
See from what i know, boy's penis' curves never really straighten out. Most women say that sex is better if there is a slight curve to the penis. unless its at a 90 degree angle. there are little tricks he can learn to do. I know there are a few in the book of kama sutra. check it out.