As far as I have read, it can even mean the way you treat or are treated by others. Emotions are said to have an effect on epigenetics, including our relationships and the way we interact with our loved ones. Is not necessarily all that impossible. There is this thing called philematology or also known as the science of the kiss. It attempts to explain that there is a level of hormonal exchange between people when they kiss. Other fields, which I can not remember the name of, also attempt to explain the same exchange in other gestures, like holding hands. So I understand that philematology and epigenetics are not the same things, but it explains mechanisms of interaction with the outside world that are not fully understood.