Irrumatio
（重定向自Throat fucking）
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 rape, in which a man forces his penis into someone else's mouth, almost always that of another man.