If you find the
G-Spot on a girl, and she enjoys it, you will know it, especially the first time. Her eyes might suddenly become
huge, she may tilt her head back, or
gasp for air. Either way, you will most likely know you hit it after a few seconds, say 20-30. Either that or she will suddenly tell you to
stop pressing there, it makes me have to pee. Whatever the sign, you probably have it.