when a guy sticks his finger(possible fingerS depending on the size of the girl down there), the guy usually rubs her pussy really good and fast until the girl gets all nice and wet.
girl: oh baby please just thrust your fingers inside of me!
To stimulate the female vagina by pleasureable alternation through rubbing and fingering the the labia, clitorius and vagina. Essentialy try to start off gentle and then pick up the pace as she begins to get off. If you do it right then she wil most probably be very wet and will want you to do it again sometime.