"...An experience with an adult may seem merely a curious and pointless game, or it may be a hideous trauma leaving lifelong psychic scars. In many cases the reaction of parents and society determines the child's interpretation of the event. What would have been a trivial and soon-forgotten act becomes traumatic if the mother cries, the father rages, and the police interrogate the child."

(Encyclopedia Britannica, 2004 Edition)

In contemporary thought, incest is invariably associated with child abuse and its horrific, long-lasting, and often irreversible consequences. Incest is not such a clear-cut matter as it has been made out to be over millennia of taboo. 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 Native American 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 - others to marriage. In some societies, incest is mandatory or prohibited, according to the social class (Bali, Papua New Guinea, Polynesian and Melanesian islands). In others, the Royal House started a tradition of incestuous marriages, which was later imitated by lower classes (Ancient Egypt, Hawaii, Pre-Columbian Mixtec). Some societies are more tolerant of consensual incest than others (Japan, India until the 1930's, Australia).

The list is long and it serves to demonstrate the diversity of attitudes towards this most universal of taboos. Generally put, we can say that a prohibition to have sex with or marry a related person should be classified as an incest prohibition.

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 oneself. 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 Revisited" and "Frequently Asked Questions".

Paradoxically, it is the reaction of society that transforms incest into such a disruptive phenomenon. The condemnation, the horror, the revulsion and the attendant social sanctions interfere with the internal processes and dynamics of the incestuous family. It is from society that the child learns that something is horribly wrong, that he should feel guilty, and that the offending parent is a defective role model.

As a direct result, the formation of the child's Superego is stunted and it remains infantile, ideal, sadistic, perfectionist, demanding and punishing. The child's Ego, on the other hand, is likely to be replaced by a False Ego version, whose job it is to suffer the social consequences of the hideous act.

To sum up: society's reactions in the case of incest are pathogenic and are most likely to produce a Narcissistic or a Borderline patient. Dysempathic, exploitative, emotionally labile, immature, and in eternal search for Narcissistic Supply - the child becomes a replica of his incestuous and socially-castigated parent.

If so, why did human societies develop such pathogenic responses? In other words, why is incest considered a taboo in all known human collectives and cultures? Why are incestuous liaisons treated so harshly and punitively?

Freud said that incest provokes horror because it touches upon our forbidden, ambivalent emotions towards members of our close family. This ambivalence covers both aggression towards other members (forbidden and punishable) and (sexual) attraction to them (doubly forbidden and punishable).

Edward Westermarck proffered an opposite view that the domestic proximity of the members of the family breeds sexual repulsion (the epigenetic rule known as the Westermarck effect) to counter naturally occurring genetic sexual attraction. The incest taboo simply reflects emotional and biological realities within the family rather than aiming to restrain the inbred instincts of its members, claimed Westermarck.

Though much-disputed by geneticists, some scholars maintain that the incest taboo may have been originally designed to prevent the degeneration of the genetic stock of the clan or tribe through intra-family breeding (closed endogamy). But, even if true, this no longer applies. In today's world incest rarely results in pregnancy and the transmission of genetic material. Sex today is about recreation as much as procreation.

Good contraceptives should, therefore, encourage incestuous, couples. In many other species inbreeding or straightforward incest are the norm. Finally, in most countries, incest prohibitions apply also to non-genetically-related people.