My last GF could only orgasm through G-spot stimulation. She preferred plain old missionary. With missionary, once you got started good, she would orgasm every 4 or so minutes, which she loved. I have always loved “doggie” but it was too intense for her. She said it just kept way too much stimulation on the spot. She would orgasm every couple of minutes and it was just too much for her. One night after we had both been doing some serious drinking, to my surprise, she did want it from behind. I had just enough whiskey dick that I got insanely hard, but it would have taken me forever to get a nut. For some reason that night (maybe it was because her senses were a little dulled) she wanted it rough from behind and leaned over the cushioned arm of the couch and let me get after it. She was moaning at the top of her lungs and having an orgasm almost every minute or so. When she finally had enough, she had tears flowing down her face, but said it was good tears.
But, one thing is for sure, everyone needs vary.
With regard to the other G-spot, are you referring to the male g-spot? To me, there is nothing hotter than a woman that will occasionally give a little prostate play.