C'mon peeps, let's keep it real here. I know there are a few around here who are perhaps a bit bigger but 8x6 is still very very big, and the vast majority of women will never encounter one that big. The average cocks the girl perhaps had before would have likely been 5" to 6" long x 4.5" to 5" girth. Suddenly being presented with an 8"x6" can be intimidating. My advice Roraman is to make sure she feels in control of how much cock she gets. It'll be best if you lie on your back and let her ride you. It will take great self restraint on your part as you'll have to try not to thrust hard, but over time she'll feel more relaxed and bit by bit she should get used to your size. But you must be patient, it might take a few weeks or months before she's made the mental and physical adjustments necessary to happily allow you to take the lead and fuck her.