Generally speaking, the doll will keep a lying position most of the time, and this means that the butt will bear most of the body's weight for a long time. So it is important to balance the butt softness and durability.
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This is not a correct 'ass'umption. Many of us do not store our dolls laying down, and also not sitting. We also do not store them laying on their front side, which would apply undue pressure on the soft gel breasts. You offer soft breasts without assuming we will store our dolls laying on them. So, why would you assume that we will store a doll laying on its soft butt?
I suggest that you allow customers to choose the softer option, and simply warn against storing the doll in any way that will apply constant pressure to the butt. So, to repeat the question someone else has asked, which you stated is possible, could we have the option to request a gel butt that is the same softness as the breasts?
Thank you for any consideration your give to this.