The difference between Face fucking and Irrumation
When used as nouns, face fucking means the act of thrusting one's penis into the mouth or throat of someone, whereas irrumation means vigorous oral sex.
check bellow for the other definitions of Face fucking and Irrumation
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Face fucking as a noun (vulgar):
The act of thrusting one's penis into the mouth or throat of someone.
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Irrumation as a noun:
Vigorous oral sex; the active penetration of a mouth with a penis