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Irrumatio is the intercrural sex act of thrusting of the penis into the mouth of a partner, between the thighs, or between the abdomens of two men. In the ancient Roman sexual vocabulary, irrumatio is strictly a form of os impurum, oral rape, in which a man forces his penis into someone else's mouth, almost always that of another man.
"Latin erotic terminology actually distinguishes two acts. First, fellation, in which the man’s penis is orally excited by the fellator. Second, irrumation, in which the man (the irrumator) ... engages in motions by moving his hips and body in a rhythm of his own choice". A Latin synonym for "irrumator" is labda (Varr. ap Non. 70,11; Aus. Epigr. 126).
Etymology and history
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The English noun irrumatio or irrumation and verb irrumate come from the Latin irrumare, to force one to perform fellatio. J. L. Butrica, in his review of R. W. Hooper's edition of The Priapus Poems, a corpus of poems known as Priapeia in Latin, states that "some Roman sexual practices, like irrumatio, lack simple English equivalents". There is some conjecture among linguists, as yet unresolved, that this noun may be derived from and an abbreviation of irruminatio and irruminare (Latin, rumen, ruminis, the mouth, throat and gullet, whence 'ruminate', to chew), therefore meaning 'the insertion into, to insert into the mouth or throat'.
As the quotation from Butrica suggests and an article by W. A. Krenkel shows, irrumatio was a distinct sexual practice in ancient Rome.[clarification needed] J. N. Adams states that "it was a standard joke to speak of irrumatio as a means of silencing someone". Oral sex was considered to be an act of defilement: the mouth had a particularly defined role as the organ of oratory, as in Greece, to participate in the central public sphere, where discursive powers were of great importance. Thus, to penetrate the mouth could be taken to be a sign of massive power differential within a relationship. Erotic art from Pompeii depicts irrumatio along with fututio, fellatio and cunnilingus, and pedicatio or anal sex. The extant wall paintings depicting explicit sex often appear to be in bathhouses and brothels, and oral sex was something usually practiced with prostitutes because of their lowly status.
Forced fellatio (i.e. oral rape) is often called Egyptian rape or simply Egyptian; this goes back to the time of the Crusades when Mamluks were alleged to force their Christian captives to do this.[page needed]
Craig A. Williams argues that irrumatio was regarded as a degrading act, even more so than anal rape. S. Tarkovsky states that, despite being popular, it was thought to be a hostile act, "taken directly from the Greek, whereby the Greek men would have to force the fellatio by violence". Furthermore, as A. Richlin has shown in an article in the Journal of the History of Sexuality, it was also accepted as "oral rape", a punitive act against homosexuality. Catullus threatens two friends who have insulted him with both irrumatio and pedicatio in his Carmen 16, although the use could also mean "go to hell," rather than being a literal threat. 
In oral sex, also known as fellatio, irrumatio is performed by actively thrusting the penis into the mouth of the partner. The term "fellatio" has expanded to incorporate irrumatio in modern English, and the latter has fallen out of widespread use.  The concept remains in more vulgar expressions like face-fuck and skull-fuck.
"Peruvian erotic pottery of the Mochica cultures represent a form of fellatio in the vases showing oragenital acts. See the vases illustrated in color in Dr. Rafael Larco-Hoyle’s Checan (Love!), published in both French and English versions by Éditions Nagel in Geneva, 1965, plates 30-33 and 133-135. The action should really be considered irrumation".
- "irrumatio in Sex-Lexis". Retrieved 2009-07-07.
- Amy Richlin, "The Meaning of irrumare in Catullus and Martial", Classical Philology 76.1 (1981) 40–46.
- G., Legman (1969). Oragenitalism: Oral Techniques in Genital Excitation. The Julian Press. p. 174.
- Charlton T. Lewis & Charles Short : A Latin Dictionary. Oxford, at the Clarendon Press. (s.v [clarification needed] "2. labda").
- Richlin, A. (1981). "Richlin, A. 1981. "The Meaning of Irrumare in Catullus and Martial". Classical Philology 76 (1): 40–46. Link to preview available from the WWW.". Classical Philology. 76 (1): 40–46. doi:10.1086/366597. JSTOR 269544.
- James L. Butrica. "Bryn Mawr Classical Review 2000.02.23". Retrieved 2009-07-07.
- Richard W. Hooper (ed. [clarification needed]) (1999). The Priapus Poems. Urbana and Chicago, IL, University of Illinois Press. ISBN 0-252-06752-5.
- Krenkel, W. A. (1980). "Fellatio and Irrumatio" in W. Bernard and C. Reitz (eds.). Naturalia non turpia (this work is one of a series of articles written by Krenkel about sexuality in the Roman Empire.). Zurich & New York: Ildesheim. pp. 205–232.
- Krenkel, Werner. "Masturbation in der Antike." "Pueri meritorii." "Fellatio und Irrumatio." "Tonguing." and "Tribaden.". Wissenschaftliche Zeitschrift der Wilhelm-Pieck-Universität Rostock. pp. 28 (1979): 159–89; 29 (1980): 77–88; 30 (1981): 37–54; 38 (1989): 45–58.
- Adams, J. N. (1982). The Latin Sexual Vocabulary. Baltimore. pp. 126–127.
- Tarkovsky, S. "Roman Sex ?C Hot Sex from the Frescos in Pompeii". Archived from the original on December 20, 2008. Retrieved 2009-07-07.
- Edwardes, Allen; Masters, Robert E. L. The cradle of erotica, New York: Julian Press, 1963.
- Williams, C. A. (1999). Roman Homosexuality: Ideologies of Masculinity in Classical Antiquity. Oxford: Oxford University Press:. p. 331.
- Richlin, A. (1993). "Preview of "Not before Homosexuality: The Materiality of the Cinaedus and the Roman Law against Love between Men"". Journal of the History of Sexuality. 3 (4): 523–573. JSTOR 3704392.
- Micaela Wakil Janan (18 January 1994). When the Lamp Is Shattered: Desire and Narrative in Catullus. SIU Press. p. 45. ISBN 978-0-8093-1765-3. Retrieved 26 May 2016.
- ""Fellatio" in Sex-Lewis". Retrieved 2009-07-07.
- G., Legman (1969). Oragenitalism: Oral Techniques in Genital Excitation. The Julian Press. p. 243.
- Legman, G. Oragenitalism : Oral Techniques in Genital Excitation. New York, Julian Press, 1969.