Devices can be penetrative or extractive. Modern automated erotic stimulation devices differ from vibrators because they penetrate as well as throb. These devices are sometimes used as part of auto-erotic or partnered bondage play. History of masturbation Sexual revolution Religious views Masturbation in non-human animals. Wikimedia Commons has media related to Sex-machines. Betty Dodson Joycelyn Elders. In The Best American Erotica , p. Johns Hopkins University Press. Retrieved 24 September
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