No culture is ever completely successful, or satisfied, with its synthesis or reconciliation of love and sex, though every culture is compelled to attempt one. No matter how socially humane, politically enlightened, spiritually attuned or technologically adapted, failure is the name of the game. Dissatisfaction to some degree is everywhere, since societies rarely, if ever, can have both. Its dissonance sounds in all spheres of culture. To date, either cultural anthropologists or evolutionary oriented researchers have confronted this eternal human conundrum.
Evolutionary theory is relentless in documenting the sex link differences in erotic perception and behavior, while virtually silent in its examination of emotional intimacy. In this entry I have explored the human pair bond from the other side of the equation ‐ emotional intimacy. Specifically I have argued that love in all its variations has a consistent theme: it is dyadic or it is 186‐nothing. Moreover, the universality of the human pair bond is evident in the rise of favorite wife or husband in polygynous family systems. This strongly suggests that human as are more emotionally monogamous than they are sexually monogamous.