Ok discovered something new with my GF. When doing missionary, the only way to make her come really hard is to hit her cervix hard. G-spot only makes her come too, but not nearly as hard as when I hit her cervix hard, normally about 10 hits and she comes down screaming. I never knew or experienced this before. When we do doggy the only way to make her come hard is by massaging her clitoris with one hand and sticking it in deep, but she wont come from cervical stimulation in that position. When she's on top she'll also only come when I hit her cervix. Can anyone elaborate?