You will always need a lubricant when will have sex with a silicone and TPE doll, otherwise you can't have sex with her. There are about 4 types of different base lubricants on the market. They are based on oil, silicone and water. All have been developed for contact with human skin, but only one is suitable and gentle for silicone and TPE skin, and it is only a water-based lubricant.
A water-based lubricant is easy to apply and wash out and will not damage your silicone doll. Therefore, never use the other ones mentioned above, which may damage the doll because they are water resistant and difficult to wash out. Silicone lubricants can even disrupt your silicone doll skin structure and significantly reduce its life. To avoid these inconveniences, only buy water-based lubricants.