Orgasm is the great feeling you get when you are very excited and the body releases the accumulated tension.
·        For a few seconds you have a very pleasant feeling in your genitals, when your love muscles rhythmically contract. At that moment your body may start to shake, as if you are losing control.
·        Guys often discover orgasm naturally while jerking-off. But for girls who masturbate it often takes time before they know how bring themselves to orgasm. They get easily excited but stay longer in the plateau phase.
·        Most girls need clitoral stimulation in order to come. Intercourse alone is not enough.
·        When guys come they normally have an ejaculation. With girls there is no such ‘proof’ of orgasm.

Girls, if you want to come, bear in mind the plateau-phase!
What does an orgasm feel like?
Descriptions of orgasm

When we are petting, how do I know if my girlfriend had an orgasm?
Can you get an orgasm when you never had an emission of semen?
When you make love, who comes first: the guy or the girl?
It takes my girlfriend forever to orgasm. Am I doing something wrong?
My best friend comes much faster than I do. How come?

How to stimulate yourself to orgasm: see masturbation.
see also: excitement, sequential orgasm, simultaneous orgasm