cuckoldry is the solution to EB9's problem

The normal definition of a cuckold is a married man whose wife cheats on him with or without his knowledge (it is usually with the males knowledge and sometimes consent, to be a true fetish). A cuckold fetishist is aware of his partner\'s activity and derives sexual pleasure from it.[3] In this subculture, the female is typically sexually dominant, while the male takes on a submissive role, only becoming involved with her or her partner when she permits it—sometimes remaining altogether celibate. Other arrangements are certainly possible, however.

The wife who enjoys cuckoldry is sometimes referred to as a hotwife or cuckoldress. [4]

Theories in evolutionary psychology
In his book Sperm Wars, Robin Baker speculated that the excitement and stimulation of the cuckolding fetish emerges from the biology of sexuality and the effects of sexual arousal on the brain. According to his theory, when a male believes that his female mate may have been sexual with another male, the male mate is prompted by biological urges to copulate with the female, in an effort to compete with the other males\' sperm. The effects of sperm competition are well documented.[5] Further, when initiating sex, the male mate thrusts harder, deeper and longer, in efforts to remove the sperm of the other male, and is biologically driven to have sex multiple times. While he may be unable to have sex more than once under usual circumstances, the cuckolded male is prone to repeated sexual efforts. Meanwhile, the wife enjoys greater sexual stimulation, first by her other male lover and second by her cuckolded husband. In addition, the wife enjoys the neurochemical highs triggered by entering into a romantic or physical relationship with another lover. These highs include the effects of oxytocin and other neurochemicals which trigger excitement, euphoria and other feelings common to the beginnings of romantic relationships. These neurochemicals change over time, and as a relationship persists, with neurochemicals changing to ones that promote bonding, planning and nurturing. When a wife takes a new lover, she triggers the neurochemicals of a new relationship, bringing home excitement to her husband.[6]