Shape, position and the O

Ladies,

Is there any corelation between the shape of the penis, and the positions to hit the O?

Seem like women tend to hit the O quickly when they rid CG with me. Some will want to get off the ride because they become too sensitive and change into other positions, while others, who are multi, can keep going on and ride longer and get more O's along the way.

I don't think I am that good, but I am guessing it's the shape and the position. Any insights?