I've been dating my current girlfriend for about 14 months now give or take. While having sex I have her sit on top of me facing me, about 8 inches in I can feel something in the back and when I stimulate it with my penis it causes her to climax. I've had multiple sex partners in the past but my current girlfriend is the only one that I've felt this spot with.
I've heard rumors of women having multiple G-spots and have assumed that that is what it is. Any information would be appreciated.