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This type of stimulation is typically all that is required to achieve orgasm and ejaculation.The speed of the hand motion varies throughout the masturbation session.Masturbation involves touching, pressing, rubbing, or massaging a person's genital area, either with the fingers or against an object such as a pillow; inserting fingers or an object into the vagina or anus (see anal masturbation); and stimulating the penis or vulva with an electric vibrator, which may also be inserted into the vagina or anus.
In the Western world, masturbation in private or with a partner is generally considered a normal and healthy part of sexual enjoyment.Both sexes sometimes apply lubricating substances to intensify sensation.Reading or viewing pornography, sexual fantasies, or other erotic stimuli may lead to a desire for sexual release such as by masturbation.Animal masturbation has been observed in many species, both in the wild and in captivity.The English word masturbation was introduced in the 18th century, based on the Latin verb masturbari, alongside the slightly earlier onanism. Suggested derivations include an unattested word for penis, *mazdo, cognate with Greek mézea μέζεα, "genitals", or alternatively a corruption of an unattested *manusturpare ("to defile with the hand"), by association with turbare "to disturb". Self-abuse and self-pollution were common in early modern times and are still found in modern dictionaries.