's Woman seated with thighs apart (1916).]]

Masturbation refers to sexual stimulation of a person's genitals, usually to the point of orgasm. Another common technique is to lie face down on a comfortable surface such as a mattress or pillow and rub the penis against it. This technique may include the use of a simulacrum, or artificial vagina. In the absence of such devices, males frequently fantasize that they are engaged in sexual relations with a partner and may seek to enhance the fantasy by viewing pornographic pictures while they are masturbating.

There are many other variations on male masturbation techniques. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Some men place both hands directly on their penis during masturbation, while others may use their free hand to fondle their testicles, nipples, or other parts of their body. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio.

The prostate gland is one of the organs that contributes fluid to semen. As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Some men also enjoy anal stimulation, with fingers or otherwise, without any prostate stimulation.

A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. This can, however, redirect semen into the bladder (referred to as retrograde ejaculation).

Mutual masturbation

It can be part of a full repertoire of sexual intercourse. It may be used as an interlude, foreplay, or as an alternative to penetration. For some people, non-penetrative sex or frottage is the primary sexual activity of choice above all others. Participants who do not want full sexual intercourse thus still enjoy mutual masturbation.

Mutual masturbation is practiced by people of all sexual orientations. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Some people choose it as an alternative to casual sex because it results in sexual satisfaction without actual sex. For some people, masturbating with friends helps lift the stigma they feel surrounding the act. This helps them develop their orgasm, increase its pleasure, and inspires them to masturbate on a more frequent basis. Similar results have been found in a 2007 British national probability survey. It was found that, between individuals aged 16 to 44, 95% of men and 71% of women masturbated at some point in their lives. 73% of men and 37% of women reported masturbating in the four weeks before their interview, while 53% of men and 18% of women reported masturbating in the previous seven days.

In males, masturbation flushes out old sperm with low motility from the male's genital tract. The next ejaculate then contains more fresh sperm, which have higher chances of achieving conception during intercourse. If more than one male has intercourse with a female, the sperm with the highest motility will compete more effectively.

In 2003, an Australian research team led by Graham Giles of The Cancer Council Australia

See also

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