Originally Posted by thirtysilver
I'm not entirely sure that people are wired to be monogamous.
I think getting to the heart of why your wife is not receptive to the idea of polyamory will be the key. Try to avoid words like "insecurity" and "possessiveness" when you question her concerns. Focus on the positives of what she can gain through embracing poly. If she isn't hard wired mono she may actually like the idea of having this freedom for herself as well. In this case it is the breaking down of social programming that can be focussed on and not trying to alter someone's nature. If she is wired mono, your challenge will probably be much greater.
I totally agree that not all people are wired to be monogamous. The trouble lies in when we fail to recognize that some people are.