Sexual penetration is a sexual activity that involves the entry into a bodily orifice, such as the vagina, anus or mouth, with a body part or an object.
When a penis penetrates a woman's vagina, it is called vaginal or sexual intercourse; when a penis penetrates another's anus, it is called anal intercourse. Penetration of the mouth by a penis is called fellatio. Penetration of the vagina by the tongue of another is one of several forms of cunnilingus. If one or more fingers are used to penetrate an orifice, it is called digital penetration. Penetration of an orifice with an object, such as a dildo, vibrator or other sex toy may also be referred to as sexual penetration, but not usually referred to as sexual intercourse. The use of a tongue for penetration is a form of oral sex, although oral sex may also occur without either the tongue entering any orifice, or any object entering the mouth. Often portrayed in pornographic films, acts involving sexual penetration may include double penetration, where one person is simultaneously penetrated in multiple orifices, by two partners.
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