The G-Spot is a small dime to quarter-sized mass of spongy tissue on the anterior (front) wall of the woman’s vagina approximately 1 to 3 inches in (closer to 3 inches in my experience) that when properly stimulated can send a woman into orgasmic pleasure the likes of which she’s never experienced before–I am not exaggerating, if a woman has only ever had clitoraly induced orgasms, a g-spot orgasm, on a scale of 1-10 will typically hit in the 7-10 range whereas a clitoraly induced orgasm will almost never exceed about a 4. G-Spot orgasms are full body orgasms, whereas an orgasm induced through clitoral stimulation is localized entirely to the clit only, HUGE difference. Not only that, but a specific type of G-Spot stimulation is how you get a woman to squirt (squirting, real squirting not the crap you see in some porn films where they’ve put water in the girl’s vagina that she shoots out while faking an orgasm, requires a very powerful full body g-spot orgasm). Ok, so here I’m going to show you a diagram so you can actually see precisely where the g-spot is and then I’ve got some awesome instructional videos that’ll walk you through precisely how to find it and stimulate it, here’s the diagram:
Alright, now lets get to the videos–in this first one they have a professional sexologist talking most of the time, among other people, who is also the author of a well-known sex guide video called “Good Vibrations”. They cover what the g-spot is, where it’s located (with diagrams), why many women think they don’t have a g-spot because they’ve been masturbating and having sex for years and have never felt anything there (they’ve been making a very common mistake) and most importantly how to stimulate it with your fingers and various sex toys. Here we go, video number 1:
In this second video he talks about where the G-Spot is, what it is precisely, and how to properly stimulate it with your fingers–he’s got a very accurate gynecologist’s model of the female genitals that he uses to demonstrate on so that you can see exactly what to do, where, how hard, what motion to use, etc. He also covers what squirting is, what’s involved (it’s called the “Skene’s glands”), the nature of the ejaculate (similar to a man’s semen minus the sperm), and what generally has to happen for a woman to squirt. There’s no actual woman involved, but with the depiction of a chick’s naked goodies I’d say that it’s probably NSFW…
Advance G-Spot Stimulation: Intercourse, Squirting, Etc.
If you really want to advance from just finding the g-spot to learning all the best techniques to stimulate it during sex, including stimulating it with your penis during intercourse (what positions, what speed, etc.) then I highly recommend you check out this resource called The G-Spot Sex Manual (aka “Female Orgasm Black Book”)–this is something my girlfriend and have tried, and we are very pleased with it so far, everything they recommend that we tried left her very happy (as in “covered in sweat with her legs shaking” happy 
), so go get it, try it out, and make your girl happy, too.