TO instruct you which I would gladly do, if I knew you age and sex. You have not supplied that information which is important. The reason for age is; if you have not gone through puberty you can still masturbate but obtaining orgasmic pleasure may be doubtful as your body has not yet released the chemicals that make that happen. As for your sex well that is simple; girls and boys masturbate differently.
You can find this on your own by typing into your search engine "hoe do boys or girls, whichever you are, masturbate." You will get a number of returns in almost tutorial form as to how to do so.
Masturbation is a very private thing and should be done someplace private where you are comfortable and will not be disturb. In your bedroom where you can lock the door or in the privacy of your bath and shower.
Contrary to what parents and religious leaders may say there is nothing wrong or sinful about masturbation. According to a recent survey about 85% of teenagers and adults masturbate. This would include your parents who most likely enjoy mutual masturbation as part of foreplay prior to intercourse.
There are many reasons for doing so in private. The main reason is for comfort, not being disturb so you can relax and enjoy the release of the sexual frustrations you may be feeling.
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