Without a doubt, premature ejaculation is one of the most common (and unfortunately worst) problems in men's sex lives.
You can find some methods to end premature ejaculation on the Internet - but most require training before actually having sex.
 But how about things you can do while actually having sex, to stop premature ejaculation? First of all, if you're about to ejaculate and it's too early to do so, you can simply withdraw your penis from your girl's vagina.
This will immediately stop all penile stimulation and if done on time, will prevent ejaculation.
And when you put it back to the vagina, you will actually be farther from orgasm when you first withdrew it.
Of course, when you withdraw your penis you should continue a sexual act by kissing your partner's lips, vagina, anus etc.
so that she's still "on track".
The great thing about this method is that if done frequently, over time it will make you be able to control your ejaculation time, and end premature ejaculation in the long run.
A second tip to keep in mind that you should avoid shallow thrusts while penetration.
 Shallow thrusts physically stimulate the head of your penis more than deep thrusts, plus they tend to be faster than deep thrusts and these two fact will bring you an early ejaculation.
What's more, a deeper penetration will satisfy your partner a lot more - she sure likes the whole of your penis, not just its head! The bottom line in this tip is that with deeper thrusts, you can end a premature ejaculation.