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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. 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 called oral sex.
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