Finding Your G-Spot - 

The G-spot, is located roughly 2.6 inches inside her vagina on the upper wall. This area inside the vagina typically has a different texture; ridged (not as smooth) as the rest of her vagina, and when aroused feels spongy.

How to find it with your fingers approximately two to three inches in, move your fingers in even circles all around the inside of the vagina. It generally feels best if you keep consistent, firm pressure along the entire length of the vaginal walls while fingering. You may wish to give a little extra pressure towards her belly as long as you don’t break the steady rotational rhythm. Stop rotating your fingers and rest your fingertips on the (usually slightly ridged) area of the vagina just behind the pubic bone and exert pressure towards her belly (upwards). This is direct G-spot stimulation, and it usually feels best if the fingers are subtly moving. You can move your fingers in small, slow circles, or point your fingers more sharply and rock them back and forth.

You can also try tracing the inside of the vagina with your finger, while moving in and out. Make sure that your fingertip always hits the g spot on each rotation.