Stages of Female Orgasm
Stage 2 is called the plateau stage; increased stimulation causes more blood flow into the vagina. The labia minor or the inner lips of the vagina take on a dark color due to the increased blood flow. She is more excited and well lubricated in this stage.
Stage 3, called the actual orgasmic stage, is marked by stiffening and lengthening of the vagina. The clitoris retracts into the clitoral hood and the muscles around the vagina and anus spasm rhythmically; sometimes the muscle contractions are felt throughout the body. Pleasure and excitement reaches its peak in those few seconds.
Stage 4 is the final stage of the orgasm known as the resolution stage when the superfluous blood drains from the genital area. The clitoris goes back to its normal size while the body revels in the orgasmic pleasure and gradually regains its composure.