Movable Skin
It is characteristic of the prosthesis’s external skin, which is mobile concerning the base on which it is mounted. The movable skin is a feature that makes the prosthesis valuable and desired because it gives a high degree of realism. Generally, prostheses, especially those for sexual intercourse, are made as a single block of material rather than as a selective composition of several independent parts; this lowers the realism of the prosthesis, which can come to look like a sex toy. The mobile skin allows you to expand both the realism and the range of sensations that can be created, allowing the prosthesis to be also used for personal pleasure (masturbation).