You can have an orgasm at any time, from many kinds of sexual stimulation, including masturbation -- it doesn't require any one particular kind of stimulation. In fact, most women do not orgasm from penis-in-vagina intercourse alone -- they need additional stimulation to have an orgasm.
The best way to learn about your body and what it likes is to experiment with it yourself and to find out what brings you the most pleasure. This will also allow you to be able to give your future partner a good idea of what you like and what you don't like!
Why don't you check out some of Miz Scarlet's advice about orgasms, and see if that helps?
How do I have an orgasm?
Sexual Response and Orgasm – A User’s Guide
[This message has been edited by ErinK (edited 07-11-2002).]