Here is a quote that explains what the gspot is and what it is that feels good:
"I'll leave out the scientific theories and just give some practical information. The female urethra runs along the front/top side of the vagina, between it and the pubic bone. In many women it is sensitive to firm strokes from inside the vagina which press it up against the pubic bone. The G-spot is supposed to be tissue surrounding the urethra, about 1 1/2 to 2 inches inside." *
And a really good explanation on why some women are uncomfortable with the feelings:
"However, if it should turn out that these experts had underestimated the sexual capabilities of women's bodies by portraying pleasurable sexual activities like female ejaculation as abnormal and/or imagined, it could have a significant effect on women's views of their sexuality. If the new evidence about these expulsions demonstrated that they are natural sexual bodily functions then many women could be free of guilt and shame about expelling fluid during sex."
For more info check out the web site
http://doctorg.com/ It is a great site that goes into great detail about the gspot and sites tests that were done to prove that FE exists and that it is not urine.