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English word fauxcest comes from English faux (Fake or artificial.), English incest
faux (English)
Fake or artificial.
incest (English)
To engage in sexual intercourse with a relative. Sexual relations between close relatives, especially immediate family members and first cousins, usually considered taboo; in many jurisdictions, close relatives are not allowed to marry, and incest is a crime.
fauxcest (English)
Incest pornography wherein the actors are not actually related, but are merely engaging in roleplay.