I had the same question at one time. I knew I had all the right parts to my body, but I didn't know how to find them, or what they really meant to me. Then I found a book to help me. The book is called Our Bodies, Our Selves . It's a kind of reference book with diagrams, but also has suggestions and input from different women and girls about their bodies.
Many women can only have an orgasm when their partners stimulate it.
When it is stimulated it prepares your vagina for sex by lubricating it and loosening those muscles. That's where your period comes out, where babies are born and one of the places that can be stimulated during intercourse. The other opening is the urethra, where you urinate. Traveling further up, you'll see on the outer part of your vagina some puffy skin that may or may not have hair on it. Inside those outer lips is skin, the colors or which vary from person to person.