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G-spot: 
The Gra"fenberg spot, or G-spot, is a small point in women behind the pubic bone that surrounds the urethra and accessible through the anterior wall of the vagina. It is putatively an erogenous area  that when stimulated leads to high levels of sexual arousal and powerful orgasms. The purported spot of the G-spot has changed over time. Two primary methods have been used to attempt to locate it. The first is based on self-reported levels of arousal during stimulation and the second based on the claim that stimulation of the G-spot leads to female ejaculation. One of the studies using self-reported levels of arousal was a case study with a single woman who claimed the experience of a “deeper” orgasm when her G-spot was stimulated. In the published study it was reported that stimulation of the anterior vaginal wall made the area grow by fifty percent. 
Another study examined 11 women in an attempt to locate the spot under laboratory conditions. Researchers attempted to find the G-spot by “palpating the entire vagina in a clockwise fashion. ”Using this technique the researchers reported discovering that 4 of the women had highly sensitive places on the anterior vaginal wall. However, to date, all attempts of scientific or empirical investigation into the reality of the G-spot have turned up nothing or highly questionable results.