I have found in lying on top and sitting on the lighter girly has all her weight over a narrower frame generating same pressure PSI as a wider heavy girl. The lighter girl has a harder body where 160+ girl is soft and with the same down force PSI. They are like a softest pillow being rammed deep into me.
I enjoy the light girl as much as the heavy girl however I have a problem of never having enough. Every time after weight gone on and I have been subject to the weight for a while I go into a mode put another one on top