View The Gallery of Known Family Affairs

Mackenzie Phillips’ “consensual” event along with her dad surprised many, but she actually is scarcely alone. Joseph Huff-Hannon speaks to individuals who state their relationships that are incestuous none of one’s company.

Joseph Huff-Hannon

Virginia Sherwood, NBC NewsWire / AP Picture

The notion of intra-family intercourse has inspired—and revolted—onlookers from Oedipus to Deliverance.

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