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Irrumatio is a form of oral sex in which someone thrusts their penis into another person's mouth, often with the intention of inducing a gag reflex and forced vomiting, in contrast to fellatio where the penis is being actively orally excited by a fellator. The difference lies mainly in which party takes the active part. By extension, irrumation can also refer to the sexual technique of thrusting the penis between the thighs of a partner (intercrural sex).In the ancient Roman sexual vocabulary, irrumatio is strictly a form of oral rape (os impurum), in which a man forces his penis into someone else's mouth, inducing vomiting for sexual gratification.The act of irrumatio with forced vomiting has become increasingly prevalent in online pornography, and has turned into a well-known pattern in the sex entertainment industry, because of its shock effect and as a form of humiliation and degradation.

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