The Gräfenberg spot (usually called G-spot) is defined as a highly sensitive area near the entrance inside of the human vagina. It is believed to be a part of the urethral sponge. Some people believe it is a bundle of nerves in the female human reproductive system. If the area is stimulated, this can cause pleasurable sensations, female ejaculation and a strong orgasm in some women. Some doctors and researchers who specialize in the anatomy of women say that there is no anatomical evidence for the spot.