This topic is great and just want to try to get my gf off that way.
But how are we to know if we (I) hit the right spot (G-spot)

?
I mean she is my first gf and she used to tell me when I got lost looking for her clit. She was like "up... left...".
But with the g-spot, she does not know and I don't know, and we have seen the pictures. We never really tried but she has never felt anything special inside her which makes me think that her g-spot has not been hit.
I am just saying: Can you tell me how to locate the spot? Is she supposed to sense it straight away? Or do I have to insist excepting that I am hitting/messaging the right spot (g)?