irrumatio

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Irrumatio (also known as irrumation or by the colloquialism face-fucking) is a form of oral sex in which a person thrusts their penis into another person's mouth, 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, irrumatio can also refer to the sexual technique of thrusting the penis between the thighs of a partner (intercrural sex).