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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. 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.
Many jurisdictions use the term sexual penetration synonymously with sexual intercourse. Many sex crimes distinguish between penetrative and nonpenetrative sex acts, with penetrative sex acts being regarded more serious than nonpenetrative sexual activities. Laws may specify particular forms of sexual penetration as part of the offense.
"Unlawful sexual penetration in the first degree" is a felony that occurs where the offender "penetrates the vagina, anus or penis of another with any object other than the penis or mouth of the actor", if the victim is "subjected to forcible compulsion", or is "under 12 years of age", or "is incapable of consent by reason of mental defect, mental incapacitation or physical helplessness"—Unlawful sexual penetration in the first degree, Oregon Statutes § 163.411
Various forms of penetration have at times been considered obscene, and been prohibited. Works containing such penetrations may be considered pornography.
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