Because you want to make sure your investment is safe. You should be able to store the doll vertically or horizontally without bending the joints to avoid permanent creases in the TPE or silicone material. Most dolls come with a vertical hanging option (the head is separate so the body can hang from a wardrobe). For horizontal storage, you can add a storage box at the time of purchase for more controlled and discreet storage of the electric hip sex doll.