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Non-penetrative sex
Non-penetrative sex or outercourse is sexual activity that usually does not include sexual penetration. It generally excludes the penetrative aspects of vaginal, anal or oral sexual activity, but includes various forms of sexual and non-sexual activity, such as frottage, mutual masturbation, kissing or cuddling.〔See (272 ) and (page 301 ) for two different definitions of outercourse (first of the pages for no-penetration definition; second of the pages for no-penile-penetration definition). 〕 Some forms of non-penetrative sex, particularly when termed ''outercourse,'' include penetrative aspects, such as penetration that may result from forms of fingering or oral sex.
People engage in non-penetrative sex for a variety of reasons, including as a form of foreplay or as a primary or preferred sexual act.〔〔See (here onwards ) and (pages 47-49 ) for views on what constitutes virginity loss and therefore sexual intercourse or other sexual activity; source discusses how gay and lesbian individuals define virginity loss, and how the majority of researchers and heterosexuals define virginity loss/"technical virginity" by whether or not a person has engaged in penile-vaginal sex. 〕 Heterosexual couples may engage in non-penetrative sex as an alternative to penile-vaginal penetration, to preserve virginity, or as a type of birth control.〔 Same-sex couples may also engage in non-penetrative sex to preserve virginity,〔 with gay males using it as an alternative to anal penetration.〔〔
Although sexually transmitted infections (STIs/STDs) such as herpes, HPV and pubic lice can be transmitted through non-penetrative genital-genital or genital-body sexual activity, non-penetrative sex may be used as a form of safer sex because it is less likely that body fluids (the main source of STI/STD transmission) will be exchanged during the activities, especially with regard to aspects that are exclusively non-penetrative.〔(【引用サイトリンク】publisher=AIDS.gov )〕
==Definitions and practices==
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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