Alongside many other factors, such as medical evidence, age-inappropriate sexual knowledge, sexualized play or aggression, and precocious or seductive behavior, excessive masturbation may alternatively be an indicator of sexual abuse. To avoid friction, irritation and soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream , or saliva. Non-penetrative sex Mutual masturbation involves two or more people who sexually stimulate each other, usually with the hands. Some techniques which may work for one individual can be difficult or uncomfortable for another. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Contrary to this belief, several studies actually reveal a positive correlation between the frequency of masturbation and the frequency of intercourse. This limitation can serve as encouragement to follow through with physical therapy sessions to help improve endurance. In general, real sex slightly increases energy consumption, according to a study published in the New England Journal of Medicine. Sexual climax, from masturbation or otherwise, leaves one in a relaxed and contented state.
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 EU Nations promote masturbation in their sex education curricula. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. That is, a difference in mortality appeared between any two subjects when one subject ejaculated at around two times per week more than the other. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. Like males, common positions for female masturbation include lying on back or face down, sitting, squatting , kneeling , or standing. On the other hand, frequent ejaculation in one's 50s was found to be correlated with a lower such risk in this same study. The speed of the hand motion varies throughout the masturbation session. In the s, Havelock Ellis reported that turn-of-the-century seamstresses using treadle-operated sewing machines could achieve orgasm by sitting near the edge of their chairs. 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". With two or more participants, the risk of sexually transmitted infections, while not eliminated, is much less than with most forms of penetrative sex. For a list of terms, see the entry for masturbate in Wiktionary. Non-penetrative sex Mutual masturbation involves two or more people who sexually stimulate each other, usually with the hands. 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 ,  a practice known as urethral play or "sounding". Techniques Two vibrators in a sex shop 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. However, this benefit may be age related. It can be practiced by people of any sexual orientation , and can be part of other sexual activity. A study has reported a significantly higher rate of masturbation in gay men and women who were in a relationship. There are many other variations on male masturbation techniques. Many women caress their breasts or stimulate a nipple with the free hand and anal stimulation is also enjoyed by some. Anal masturbation without any prostate stimulation, with fingers or otherwise, is also one other technique which some men enjoy. Terms such as playing with yourself, pleasuring oneself and slang such as wanking,  jerking off,  and frigging are common. Problems for males A man whose penis has suffered a blunt trauma, severe bend or other injury during intercourse or masturbation may, rarely, sustain a penile fracture    or suffer from Peyronie's disease. 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.
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