Some people stray and have sex with others in order to preserve and persevere in a longterm obsessed and abusive relationship.

Extradyadic sex in such couples (in the wake of drinking or substance abuse) serves to exact revenge on the partner, restore a power symmetry within the couple, cater to unmet emotional or sexual needs, and affirm an internalized bad object (the disparaging partner’s point of view).

Such promiscuous, unboundaried, and sexually selftrashing behavior typically follows a period of loyal faithfulness met with traumatizing rejection and abandonment by the partner.

Whenever offered intimacy by the external instrumentalized and objectified sex partners (an invitation to stay longer or sleep over or meet again), the cheater reacts aggressively, recoils, and hurries back to her primary partner to reaffirm their dysfunctional bond.

Such a relationship dynamic is conducive to an inversion of traditional stereotypical gender roles: women become sexually predatory and men react with dysregulation. This is especially the case when both have daddy or mommy issues.

Narcissists cheat on their spouses, commit adultery and have extramarital affairs and liaisons for a variety of reasons which reflect disparate psychodynamic processes:

1. In the quest for narcissistic supply, the somatic narcissist resorts to serial sexual conquests.

2. Narcissists are easily bored (they have a low boredom threshold) and they have a low tolerance for boredom. Sexual dalliances alleviate this nagging and frustrating ennui. The quest for novelty, diversions, and thrills – a vacation from his own life is combined with a journey of selfexploration and discovery that involves “filling in the gaps” in the narcissist’s biography: a missed adolescence, an old flame, a new aspect of his personality.

3. Narcissists maintain an island and focus of stability in their life, but all the other dimensions of their existence are chaotic, unstable, and unpredictable. This "twister" formation serves many emotional needs which I expound upon elsewhere. Thus, a narcissist may be a model employee and pursue a career path over decades even as he cheats on his wife and fritters their savings away.

4. Narcissists feel superior and important and so entitled to be above the law and to engage in behaviors that are frowned upon and considered socially unacceptable in others. They reject and vehemently resent all limitations and conditions placed upon them by their partners. They act on their impulses and desires unencumbered by social conventions and strictures.

5. Marriage, monogamy, and childbearing and rearing are common activities that characterize the average person. The narcissist feels robbed of his uniqueness by these pursuits and coerced into the relationship and into roles such as a husband and a father that reduce him to the lowest of common denominators. This narcissistic injury leads him to rebel and reassert his superiority and specialness by maintaining extramarital affairs.

6. Narcissists are control freaks. Having a relationship implies a giveandtake and a train of compromises which the narcissist acutely interprets to mean a loss of control over his life. To reassert control, the narcissist initiates other relationships in which he dictates the terms of engagement (love affairs).

7. Narcissists are terrified of intimacy. Their behavior is best characterized as an approachavoidance repetition compulsion. Adultery is an excellent tool in the attempt to retard intimacy and resort to a less threatening mode of interaction.

There are two types of triangulation (using a third party to manage the emotional, intimacy, and transactional aspects of a relationship): breakup and restorative.

Breakup triangulation involves overt and ostentatious cheating with a third party in conjunction with other egregious misbehavior. Its aim is to irrevocably break up with a current partner.

Why triangulate rather than simply terminate? A myriad reasons: revenge, rage, community property, inability to let go (codependency), restoring the cheater's selfesteem, feeling desirable and alive again, obtaining succor and ersatz intimacy, or uncertainty about one's true wishes.

But usually, it is simply the desire to cast one's mate as the villain who ended it all because of he is insanely jealous and not magnanimous or empathic enough to forgive and understand.

Restorative triangulation has the exact opposite goal: to revive the relationship by provoking an emotional response from the jilted partner. Such triangulation involves the mere favorable mention of another person, hints at possible misconduct or compromising circumstances, or, at a maximum, aggressive flirting and nonpenetrative sex acts, such as kissing, petting (making out), or hugging.

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