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You should not do sex immediately with partner. Spend more time doing foreplay as that will make more erection and more time for ejaculation. When having sex, as soon as you feel semen going to come, you should take out your penis from her vagina and ask her to pinch the tip of your glans penis head with her finder and thumb. This is a good technique to prevent semen from coming at that time. This way you can do sex again and for long time. Repeat whenever you feel it's going to come and for how long you want to prolong.

Hi
premature ejaculation is most common sexual problem in men it is most common in younger men (aged 18-30 y) .Premature ejaculation is believed to be a psychological problem and does not represent any known organic disease involving the male reproductive tract, you need not worry about ur problem.The human sexual response can be divided into 3 phases: desire (libido), excitement (arousal), and orgasm.If you can delay the orgasm,with some technique so you should be consult a psychiatrist, he will teach u how to prevent premature ejaculation of by squeez technique, start and stop technique.
Performance anxiety, the fear of failing to perform well should be avoided. Enjoy the interaction and don't aim or worry about the performance.
You wait until you are close to climax and then you withdraw your penis and squeeze the glans (head) very hard for several seconds. The blood will flow out and you will become flaccid. Then you can regain an erection and resume penetration once more.For some reason it seems to work better when your wife does the squeeze for you, instead of yourself.