Definition of "twincest" [twincest]

• Incestuous sexual relations between twins, or siblings who look very similar. (noun)

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• "(I hate that they've introduced "twincest" into my lexicon ...) - This article about how John Travolta"
• "Plus of course "twincest," something that usually is found in shoujo manga with two twin boys."
• "Fans have even nicknamed their relationship, "twincest," giving it an identity that, in some ways, seems to normalize it."