There is a medical procedure called Graffenberg Spot Amplification or the "G-shot" if you will. A small amount of human collagen (1-2cc) is injected directley into a womens G-spot, thus causing it to project out slightly into the vagina. This causes a increase in friction and arousal. This procedure was invented and perfected by Dr. David Mattlock in California several years ago. For more info on this subject drop me a line or look it up on line under G-Shot!