Just thought id give my two cents worth on this topic.
In my expereince I have found that women do have a G-Spot and most have the ability to have gushing orgasms.
As Alley wrote above the way to stimulate the area is to insert 1 or 2 (or 3, depending on your girl) fingers into her vagina. With your palm facing upwards, hook your fingers around upwards and apply pressure to the vaginal wall in the area that would be directly under where the clitoris is. The vaginal wall around here has a different feeling, almost like a ribbed type of texture. Stimulate this area with fingers in a rythmic fashion, whilst getting your partner to stimulate her clitoris from above. I find this ‘double hit’ on the clitoris and vaginal wall G-Spot to be quite effective in bringing on an orgasm.
I am also told that this orgasm is different in feeling to a clitoral or vaginal orgasm (one brought on by activities such as fisting) and is QUITE intense. Also it is noted that it is quite hard to manually stimulate the G-Spot, and nearly always requires a partner to do so, as it is just out of reach with an outstretched arm.
Logic seems to point out that the G-Spot is actually the back of the clitoris, the part that is normally not scene (as it is buried in tissue), and normally not stimulated either, though im sure there is a HEAP of nerve endings down there. There are actually deep clitoral piercings (body) that you can get that will also stimulate the back of the clit (trianlge piercing), so Im sure the area is known to people who expereiment and play with their bodies.
Female gushing orgasms is another topic which i have a little bit of knowledge about. From my expereince most women have the ability to gush, but not all are willing to go the hard yards to do it.
The female ejaculate, while occasionally containing traces of urine is actually the ‘wetness’ produced during foreplay and intercourse. The key to gushing is about building up and orgasm, the stopping, building up, then stopping, and so on. This may need to be done for 1 to several hours (2-3, though more if your able to, and have the will power).
This continual stopping and starting of the orgasm produces more and more wetness, which builds up in the vagina. Eventually when the orgasm is reached it is much more intense (due to the sexual energy being built up), which makes the vagina spasm, squirting the built up wetness from the vaginal opening.
The key to gushing but is masturbation, I have never seen anyone gush from sexual intercourse, only manual stimulation.
Hope this bit of information clears some things up 
Keep playing
INSANE1