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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 pharyngeal 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 is present in some online pornography, partly because of its shock effect and as a form of humiliation and degradation.

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