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What Is a Sex Machine? A sex-machine is an elegant adult toy that blends motion and vibration in order to create a beautiful blend orgasm. They are available in a variety of shapes and sizes including thrusting devices such as the Hismith® 4.0 to saddle-style devices which you can sit on or stand on. Some even allow app-controlled play for partnered scenes that are ideal for BDSM. Size Sexy toy machines can vary in size and power. Some are made to be used