The curvature of your penis can either be genetic, or the result of some trauma. So, despite what others may have said, it is very unlikely that how you masturbate has caused your penis to curve. Also, a great number of guys have at least some curvature, and it is usually nothing to worry about.
If you have a school physical, or some other appointment with a doctor, I suggest asking him about it. My bet is that he'll tell you that you are fine, but it can't hurt to ask about it.
Hi why ask and you already Know ???????????
i've seen a lot of people in other forums like this one that it can be caused by masturbating with a certain hand.
Hi the curve has got nothing to do how you masturbate, most males are like it if you are still worried please see Dr. Take care..........Bob