Male Masturbation. There are references to Male Masturbation throu ghout history, In the ancient world; depictions of male masturbation are relatively common. However it was primarily during the s and s when masturbation was first associated wi th mental and physical deficiencies. Some prominent physicians, scientists, philo sophers, and religious leaders believed that illnesses such as insanity, vision and hearing problems, epilepsy, mental retardation, and general health problems were caused by self-sti mulation. The fear of masturbation was so great that throughout the world, extreme preventative measures were instituted incl uding the use of mechanical restraints, genital surgery, and physical discipline. By the 19t h century the cereal magnate John Harvey Kellogg declared " sex for anything but reproduction " to be " sexual excess. We now have come full circle with many simila r versions of these early devices being freely available today within the BDSM scene. New thinking within the medical profession leads us to believe that male masturbation is generally good for Male health especially in the prevention of Male prostate cancer, which seems to be on the increase. Men could reduce their risk of developing pros tate cancer through regular masturbation, researchers suggest. They say ca ncer-causing chemicals could build up in the prostate if men do not ejaculate regularly.
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Erotic electrostimulation abbreviated e-stim  and also known as electrosex is a sexual practice involving the application of electrical stimulation to the nerves of the body, with particular emphasis on the genitals , using a power source such as a TENS , EMS , violet wands , or made-for-play units for purposes of sexual stimulation. Electrostimulation has been associated with BDSM activities, and erotic electrostimulation is an evolution of that practice. Electrostimulation, in general, can cause tissue damage or even death if misused. The international standard on the basic safety of medical nerve and muscle stimulators advises "that stimulation should not be applied across or through the head, directly on the eyes, covering the mouth, on the front of the neck, especially the carotid sinus , or from electrodes placed on the chest and the upper back or crossing over the heart". It imposes the following limits on the output parameters of stimulators for therapeutic purposes :.