How do I prevent pre-mature ejaculation? -
Well, you need to practice!
Next time you pleasure yourself, build up the feeling until you-re right at the brink. Then stop. Go do something else for a few minutes that doesn-t turn you on. Go back and bring yourself to that point again. Then stop. Repeat 3 or 4 times and then let yourself go. This should build tolerance and get yourself used to the feeling so you can be more familiar with your body and at what points it reacts to certain stimulus.
You have to lengthen your masturbation sessions. When you feel like you are going to ejaculate, stop. Wait a few minutes, then keep going again. Do this several times before letting yourself orgasm. This will eventually train your body to last longer during sex. You want to get it to wear you have to work hard for at least 10-15 minutes to get an orgasm. Everytime you masturbate make it long and draw it out.