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<br>Incest is not such a clear-cut matter as it has been made out to be over millennia of taboos. Many participants claim to have enjoyed the act and its physical and emotional consequences. It is often the result of seduction. In some cases, two consenting and fully informed adults are involved. Many types of relationships, which are defined as incestuous, are between genetically unrelated parties (a stepfather and a daughter), or between fictive kin or between classificatory kin (that belong to the same matriline or patriline). In certain societies (the American Indians or the Chinese) it is sufficient to carry the same family name (=to belong to the same clan) and marriage is forbidden. Some incest prohibitions relate to sexual acts - other to marriage. In some societies, incest is mandatory or prohibited, according to the social class (Bali). In others, the Royal House started a tradition of incestuous marriages, which were imitated by lower classes (Ancient Egypt). The list is long and it serves to demonstrate the diversity of this most universal taboo. Generally put, we can say that a prohibition to have sex with or marry a related person should be classified as an incest prohibition, no matter the nature of the relationship.
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<br>Perhaps the strongest feature of incest has been hitherto downplayed: that it is, essentially, an autoerotic act. Having sex with a first-degree blood relative is like having sex with yourself. It is a Narcissistic act and like all acts Narcissistic, it involves the objectification of the partner. The incestuous Narcissist over-values and then devalues his sexual partner. He is devoid of empathy (cannot see the other's point of view or put himself in her shoes). For an in depth treatment of Narcissism and its psychosexual dimension, see: "Malignant Self Love - Narcissism