Theautomatic masturbatorreplaces manual movement with a motorized mechanism, pistons, rotation, or suction, which maintains a constant rhythm and intensity without effort. Advanced models vibrate, heat to body temperature, and have multiple modes. The manual masturbator offers total control over the rhythm but requires the use of hands. Those looking for hands-free or a more intense experience go straight for theautomatic masturbator; those who want to control everything prefer the manual one.