Reading or viewing pornography, sexual fantasies, or other erotic stimuli may lead to a desire for sexual release such as by masturbation.
Some people get sexual pleasure by inserting objects, such as urethral sounds, into the urethra (the tube through which urine and, in men, semen, flows), Some people masturbate by using machines that simulate intercourse.
The English word masturbation was introduced in the 18th century, based on the Latin verb masturbari, alongside the more technical and 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".
Prostate massage is one other technique used for sexual stimulation, often in order to reach orgasm.
The prostate is sometimes referred to as the "male G-spot" or P-spot.
Various medical and psychological benefits have been attributed to a healthy attitude toward sexual activity in general and to masturbation in particular.
No causal relationship is known between masturbation and any form of mental or physical disorder.
The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction.