The internal clitoris is the portion of the sensitive female sex organ that extends beyond the tiny, button-like external, or glans, clitoris. The internal clitoris is 4 inches long, on average, and forks out along the sides of the vaginal opening toward the perineum. Only the tip, or the glans, of the clitoris shows externally. That portion of the clitoris can be easily stimulated. However, the internal clitoris may also be stimulated using a powerful vibrator.