if you are masturbating,,,use the other hand to caress and tickle your analhole entrance...do it with a lubricant so you can feel more exited with the slippery action,,,dont penetrete your analhole just play outside it,,unless you feel de need to get a finger tip in it...
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Now if you are having sex with somebody,,just laid on one side and lift a leg well high and when you been penetrated tell him to use his fingertips only and caress and tickle your analhole,,,tell him to use a lubricant....i promise you ,,that you will have a extreme cum and quick too.
You will become very very very hook on this,,,i swear.

Please ignore Habichuleo.

Anyway...

There are two kinds of orgasms, so depending on what kind you wish to achieve, you're going to have to do different things. There is the vaginal orgasm and the clitoral orgasm.

You can still stimulate the clitoris while having vaginal sex. There is nothing wrong with doing this, and it is the only way many women can clitorally orgasm! I myself have to manually stimulate during sex.

For a vaginal orgasm, you need to stimulate the g-spot. This will feel like you have to pee. You should let go and relax. Some liquid may come out, but this is not urine! It is called female ejaculate, and is secreted from glands between the vagina and the urethra. This is why it feels like you have to pee. The urethra fills with the liquid, and when you orgasm it is released.

I agree with Eiri..