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Sex position
Sex positions are positions that people may adopt during or for the purpose of sexual intercourse or other sexual activities. Sexual acts are generally described by the positions the participants adopt in order to perform those acts. Though sexual intercourse generally involves penetration of the body of one person by another, sex positions commonly involve penetrative or non-penetrative sexual activities.
Three categories of intercourse are commonly practiced: vaginal intercourse, involving vaginal penetration; anal penetration; and oral sex, involving mouth-on-genital stimulation. Sex acts may also involve other forms of genital stimulation, such as solo or mutual masturbation, which may involve rubbing or penetration by the use of fingers or hands or by a device (sex toy), such as a dildo or vibrator. There are numerous sex positions that participants may adopt in any of these types of sexual intercourse or acts; some authors have argued that the number of sex positions is essentially limitless.
==History==
The earliest known European medieval text dedicated to sexual positions is the ''Speculum al foderi'', sometimes known as "The Mirror of Coitus" or literally "a mirror for fuckers", a 15th-century Catalan text discovered in the 1970s.〔Michael R. Solomon, editor (1986). ''Text and Concordance of Speculum al foderi, Biblioteca Nacional MS. 3356''. ISBN 0-942260-60-0〕〔Michael R. Solomon (1990). ''The Mirror of coitus : a translation and edition of the fifteenth-century Speculum al foderi''. Spanish. ISBN 0-940639-48-3〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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