It's not harmful.
Christian books may tell you it is.
But most guys and a lot of girls do it.
Usually even during sex, a guy may jerk himself off a little to make sure he's really hard.
There's nothing wrong with it, as long as its not an addiction effecting your daily life.

Munky is right. There is nothing wrong with it, it will not hurt you, and it is nothing to be ashamed of. It's very normal :)

What do you mean by 'jerking off?'

Jerking off is slang for masturbation.

hi i am 18 yrs old.i am jerking for about 2 years.i could not stop it.please tell any method to stop jerking.....

cyrilcyril70,
Masturbation, or jerking off as it is referred to here, is very normal and natural so you shouldn't worry about doing it. If it is the only method of sexual release for you then you may want to look at expanding your social circles to get yourself a partner to enjoy sex with.

Wendy