Oxytocin has often been cited as a mechanism linking female pleasure to a range of social and biological effects.
- Oxytocin is an altruistic hormone, a love hormone (Michael Odent)
- Oxytocin deficiency enhances stress, obesity and psychotic behavior, impairs cognitive functions and increases breast-cancer risk. (Wai Says)
Meanwhile Marnia Robinson and Gary Wilson argue that conventional sex tends to over-stimulate the pleasure/reward center deep within the brain. Over time, this leads to subconscious defensiveness and emotional distance between partners. Once uneasiness enters an intimate relationship, the bond between the partners tends to weaken, ultimately producing less oxytocin. In their view, biology's agenda unravels relationships over time despite oxytocin's bonding properties, and they advocate alternative practices that maintain and increase oxytocin between partners - in other words, intervening to subvert what they believe to be biology's agenda.
So now we have two theories. One in which the quantity of trust depends on the quantity of oxytocin, and one in which the quantity of oxytocin depends on the quantity of trust.
If we can't tell which is the effect, and which the cause, then POSIWID becomes a spiral.