They are already lubricated, but I don’t know if the grease is compatible with silicone sex doll. I rinsed them out. Without lubricant, it is almost impossible to fully insert, so I used a little water-based lubricant to help it slide in. The problem is that if it slides in easily enough, it will come out just as easily, appearing awkward and distracting during the game. Thanks for sharing your experience. I don’t think I should be surprised. I wonder how that thing can stay without doing the same thing? Because assuming this woman is aroused, will she release a lot of lubricant between her vaginal wall and the membrane of the condom? Maybe the real vagina shape is different? I just thought that using these things might mean that I could get out of the potty. I think you’re right about the shape of the sex dolls, this is the space that allows the inner retaining ring to expand and hold it in place. With a doll, there is no ring that can be expanded and fixed in place. Maybe someone will give better luck. I haven’t tried female condoms, but there are some.