Machine in ass

Electro-mechanical vibrators followed once electrical energy was harnessed.

Most of these were much larger and more powerful than today's standard devices, restricting ownership to the rich or to specialist medical centres. They resembled in size (though not in operation) what are now commonly termed Fucking Machines.

With mass production, vibrators grew smaller and cheaper, sharply curtailing the market for earlier models.

Modern automated erotic stimulation device differ from vibrators because they penetrate as well as throb. Mass attention is drawn to them on the Internet, while appetite for these powerful appliances has induced the establishment and growth of manufacturers to satisfy rising demand.