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What Is a Sex Machine? A sex-machine is an elegant adult toy that blends motion and vibration to create a stunning blended orgasm. They come in all sizes and shapes including thrusting machines such as the Hismith 4.0 to saddle-style devices you can sit or straddle on. Some even allow app-controlled play for partnered scenes which is perfect for BDSM. Size Sex toys can differ in terms of size and power. Some are designed to be used as a single, while others can be used by couples. These toys are