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That's the worst use of schlong physics I've ever seen!
What you should have pointed out is that a larger dong has a greater surface area, meaning a greater flux per stroke, hence a larger loss of force due to kinetic friction.
Since kinetic friction acts in the opposite of the direction of thrusting, it takes a lot more energy to fuck a chick with a larger dong because greater mass for the same velocity requires more kinetic energy: KE=½mv²
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