Depth bottoms use toys for the following reasons:

• Reprogramming | The nervous system must undergo massive changes to interpret fisting as highly pleasureable and override reflexes to allow objects (hands and arms) to travel in the opposite direction of the regular contents of the colon.
• Dilation | The smooth muscle tissue and the structural connective tissue must be gradually stretched to prevent perforation injuries.
• Remodeling | The pelvic inlet and outlet can undergo growth that creates easier passage through widening of the pelvic inlet and outlet.

Toys, unlike play partners, provide the ability to size up or down. Toys are always available for play. Toys offer symmetry and consistency needed for neural reprogramming.