Masturbation
Frequency, age, and sex

Frequency of masturbation is determined by many factors, e.g., one's resistance to sexual tension, hormone levels influencing sexual arousal, sexual habits, peer influences, health and one's attitude to masturbation formed by culture; E. Heiby and J. Becker examined the latter. Medical causes have also been associated with masturbation, wherein masturbation is not cause, but effect, with the exception of inserting foreign objects into the urinary bladder.

Different studies have found that masturbation is frequent in humans. Alfred Kinsey 's 1950s studies on the US population have shown that 92% of men and 62% of women have masturbated during their lifespan. Similar results have been found in a 2007 British national probability survey. It was found that, among 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.

The Merck Manual says that 97% of men and 80% of women have masturbated and that, generally speaking, males masturbate more than females. It states that almost half of the population reported to have masturbated in the past four weeks.

Masturbation is considered normal when performed by children, even in early infancy. In 2009, the Sheffield NHS Health Trust issued a pamphlet called "Pleasure" which discussed the health benefits of masturbation. This was done in response to data and experience from the other EU member states to reduce teen pregnancy and STIs (STDs), and to promote healthy habits.

According to the New Oxford Textbook of Psychiatry (1st ed.), "Masturbation and sexual play are common well before puberty. Sexual behaviour in young children is common, and should only be regarded as a sign of sexual abuse when it is out of context and is inappropriate."

In the book Human Sexuality: Diversity in Contemporary America, by Strong, Devault and Sayad, the authors point out, "A baby boy may laugh in his crib while playing with his erect penis". "Baby girls sometimes move their bodies rhythmically, almost violently, appearing to experience orgasm." Italian gynecologists Giorgio Giorgi and Marco Siccardi observed via ultrasound a female fetus possibly masturbating and having what appeared to be an orgasm.

Popular belief asserts that individuals of either sex who are not in sexually active relationships tend to masturbate more frequently than those who are; however, much of the time this is not true as masturbation alone or with a partner is often a feature of a relationship. Contrary to this belief, several studies actually reveal a positive correlation between the frequency of masturbation and the frequency of intercourse. A study has reported a significantly higher rate of masturbation in gay men and women who were in a relationship.

Coon and Mitterer stated: "Approximately 70 percent of married women and men masturbate at least occasionally."

Mitterer, Coon and Martini wrote in 2015: " Do more men masturbate than women? Yes. While 89 percent of women reported that they had masturbated at some time, the figure was 95 percent for men. (Some cynics add, 'And the other 5 percent lied!')"
detectable_content:postscript