How do you prevent early ejaculation in man?

One very well known method is the "stop - start" method. The idea is to masturbate until you begin to feel ejaculation coming close, then STOP. Wait a few minutes and do this again, and a third or fourth time if you wish. Continue doing this for at least a week and see the effects. The idea behind it is to train your body to not ejacualte immediately when it feels it approaching.

Use a product called "Numzit" or equivalent. It is used for tooth pain. It is a pain medicine in a tube that temporarily numbs the nerve endings. Rub some on the head of your penis before sex and you will last a long time. The effects wear off normally in a couple hours. Alternatively if you can get the doctor to give you a prescription of "Prozac", the side effect of this drug is it takes longer to achieve orgasm.