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The taboo against incest in Ancient Rome is demonstrated by the fact that politicians would use charges of incest (often false charges) as insults and means of political disenfranchisement.
In Norse mythology, there are themes of brother-sister marriage, a prominent example being between Njörðr and his unnamed sister (perhaps Nerthus), parents of Freyja and Freyr.
First, most prohibitions on incest cover affinity relationships—that is, relationships created by marriage (for example, father-in-law and stepfather)—as well as relationships created by adoption.
And second, the incest taboo also applies to non-procreative sex—for example, sex between infertile relatives, relatives of the same sex, or sex performed with birth control.
According to 2 Samuel, Amnon, King David's son, raped his half-sister, Tamar (2 Samuel 13).
In Genesis -38, living in an isolated area after the destruction of Sodom and Gomorrah, Lot's two daughters conspired to inebriate and seduce their father due to the lack of available partners to continue his line of descent.
For example, Tutankhamun married his half-sister Ankhesenamun, and was himself the child of an incestuous union between Akhenaten and an unidentified sister-wife.
It is now generally accepted that sibling marriages were widespread among all classes in Egypt during the Graeco-Roman period.
Such children are at greater risk for congenital disorders, death, and developmental and physical disability, and that risk is proportional to their parents' coefficient of relationship—a measure of how close the parents are related genetically.
Loki in turn also accuses Freyja and Freyr of having a sexual relationship.