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  1. The secret of the male sex toy you didn't know

    The early invention of the airplane cup was used to solve the problem of drinking water for pilots. A layer of inner liner was added to the cup and a high-elastic silicone layer was added to fill the cup, so that the liquid can be put in, and it will not flow out easily, which is convenient for the pilot to drink water. use.
    The airplane cup is mainly composed of two parts of the outer shell and the inner soft rubber. The inner soft rubber structure has a tortuous path, and the narrow and ...