"Monogamy does not apply to all marriages. There is no way I could want to give you up to a man like Isaac knowing what he is capable of in the bedroom with you if this were so Helen. Then there is this about oxytocin and how your body works. Given Isaac's sexual prowess your desire to be with him is understandable. It's clear you can want Isaac as a lover for desires beyond my ability. And I am able to get beyond things like jealousy because of my desires to see you with a exceptional lover. It's neither wrong nor immoral, it's just the way thing are.
Sometimes called “the cuddle hormoneâ€, oxytocin is released in response to a variety of environmental stimuli including skin-to-skin contact and cervical stimulation experienced during sex. At normal levels oxytocin encourages a mild desire to be kissed and cuddled by your lover. But being touched (anywhere on the body) leads to a rise in oxytocin levels. This causes a cascade of reactions within the body, including the release of endorphins and testosterone, which results in both biological and psychological arousal. The nerves in erogenous zones such as the earlobes, neck and genitals become sensitized by the effects of oxytocin. It promotes a bond of intimacy, closeness and desire which increases sexual receptiveness and the desire to be touched further – being touched further causes even more oxytocin to be released and so desire and arousal is heightened even more."