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According to Hideo Tokuoka, "When Americans think of incest, they think of fathers and daughters; in Japan one thinks of mothers and sons" due to the extensive media coverage of mother-son incest there.
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However, because close relatives share a large fraction of their alleles , the probability that any such rare deleterious allele present in the common ancestor will be inherited from both related parents is increased dramatically with respect to non-inbred couples.
Incest is mentioned and condemned in Virgil 's Aeneid Book VI:  hic thalamum invasit natae vetitosque hymenaeos; "This one invaded a daughter's room and a forbidden sex act".
Description: Terms like incester    and incestual   have been used to describe those interested or involved in sexual relations with relatives among humans, while inbreeder has been used in relation to similar behavior among non-human animals or organisms.