What is the difference between the all-in-one vagina and the marriage hole vagina?
The marriage hole can be removed and washed easily. It is very convenient. The marriage hole is made from a very durable high elastomer material. The all-in-one type is very aesthetic. However, you cannot remove this (except for lip part of a vagina).
The outer lip is very delicate. Therefore, we recommend it being well lubricated with copious water based lubricant in order to reduce friction. If the lip part is split by friction, you'll able to use spare lip parts and a lip repair kit which are enclosed with the DOLL.