vasopressin and monogomy in humans?

One of the discussion topics that caught my interest this week was the study using vasopressin injections in prairie and meadow voles to change their mating behaviors. I wonder if vasopressin also affects monogamy in humans. For instance: some humans are more faithful than others in relationships and I wonder if looking at a “cheater” vs. “non-cheater” would reveal different levels of vasopressin. This immediately made me think of Tiger Woods: is he just a sleazy jerk or is there something in his brain that makes monogamy difficult for him? I also wonder if there are differences in vasopressin levels between males and females. This may be inaccurate on my part, but I feel as though males are traditionally characterized as more promiscuous than females. This would bring us back to genes vs. environment: do males have less vasopressin or do cultural expectations and gender roles condone this kind of behavior?

If vasopressin does indeed play a role in the sexual behavior of humans, I wonder what this could mean for society. Currently sex addiction is treated with methods such as therapy and education about healthy sexuality, but is it possible that giving someone a shot of vasopressin could cure their addiction? I would assume there is a lot more to monogamy than vasopressin levels, including factors such as personality and strength of relationship bond, but I wonder how strong the relative roles of each of these factors are.

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