All you need to do is use some good lube.
This one is no walk in the park for the man either.
He often says that his dick is not that big to reach my ultimate point.
Let me tell you a few things:
Have her grab behind your shoulders for extra support.
Just make sure not to break any furniture.
The Chairman How He sits on the edge of the bed and you sit on him, facing away.
Unlike most other oral positions, this Doggy-Style one is crazy bending ability aside pretty much just for performing on women.
Of course, standing positions aren't for everyone.