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Mammary intercourse is a sex act, performed as foreplay or as non-penetrative sex, that involves the stimulation of the male penis by the female breasts and vice versa.〔Alex Comfort, ''The Joy of Sex'' (1972) p. 67-9〕 ==Practice== Mammary intercourse involves the man placing his erect penis in the woman's cleavage and thrusting between her breasts, while the breasts are squeezed around the penile shaft, thus creating a tight cleft for stimulation.〔 The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts.〔Alex Comfort, ''The Joy of Sex'' (1972) p. 69〕 Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts (what Margot Anand terms ''local orgasms of the breast''),〔Alex Comfort, ''The Joy of Sex'' (1972) p. 69 and p. 175〕〔Margo Ananad, ''The Art of Sexual Ecstasy'' (1990) p. 309〕 and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the ''Paradis Charnels'' of 1903.〔Alex Comfort, ''The Joy of Sex'' (1972) p. 176〕 It can be combined with fellatio and the woman may move her breasts up and down on the penis for an additional stimulation, usually before the man reaches orgasm. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection (STI) that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. HIV is among the infections that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. A study of the condom usage habits of New Zealand's sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom. One sex worker said that mammary intercourse was one alternative used; mammary intercourse performed by a woman with large breasts felt to the client like penetrative vaginal sex.〔Woods, 1996, in Davis, pages 125-127〕 Mammary intercourse has sometimes been considered a perversion.〔Clifford Allen, ''A Textbook of Psychosexual Disorders'' (1969) p. 200〕 Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity (i.e. the repudiation of all other forms of sexual contact).〔Sigmund Freud, ''On Sexuality'' (PFL 7) p. 65 and p. 75〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mammary intercourse」の詳細全文を読む スポンサード リンク
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