In my experience fat does influence sex substantially. With skinny girls I would get much more penetration in the side position because their ass does not get in the way. It is possible to get deep penetration with larger girls, but the selection of positions to achieve this goes way down. Similarly, I would imagine that having a large fat pad would put some limitations on giving the full package, except in some positions and at some pressures. Even so, when you measure base pressed with a ruler you have a very small surface area to press with. When you think about pressing with the entire fat pad it is much harder to get the same base pressed measurement. All in all, losing the fat pad ensures more dick in all positions, more visual appeal, and most importantly better health.