You're suppose to aim for the curvature of the bowl. If I can put it a different way, when you're driving a car and the road curves, you follow the road and curve around. Now what you're doing is cutting across and slamming into a brick wall at 90mph… that is if your pee was the car, the brick wall was the urinal, and the road is the curvature of the bowl you should be aiming for.