There are basically two types of love doll vaginal designs (not inserts) that your doll will have. One design (the best) is the one where the vaginal passage and anus passage are connected. This design allows water/cleaning solution injected into the vaginal passage to exit out the anal passage, which is great for an exceptional cleaning. The other design has the vagina and anal passages separate and unconnected. Because they're not connected, special attention should be used during cleaning. The cleaning solution used must enter and exit the same passage in this design, which means the solution must reach the back of either cavity or residual matter may not be washed out completely and create a very bad unhealthy situation. When you can't really see how well you have cleaned something, you don't really know if the cleaning was actually successful. In my opinion, all love dolls should have the vaginal passage and anal passage connected design, as any cleaning solution injected into the vagina (with a decent cleaning device/injector, not a weak flimsy one) will shoot through both passages and exit the anal passage with enough force to keep the doll clean and fresh each and every time. Bacteria and mold can hurt you, keep that in mind when cleaning your doll always.