Irrumatio

Irrumatio is the act of thrusting of the penis into the mouth or throat, between the legs, breasts, feet or upper thighs (also known as interfemoral sex), or between the abdomens of two partners. In the ancient Roman sexual vocabulary, irrumatio is strictly a form of os impurum, oral sex, 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

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".