The counsellor that we went to had never heard of it either. I found some documents online that were aimed at professionals, printed them out and gave them to her. She really took them on board and understood the concepts really well and was able to come up with some great analogies which helped our discussions.
This one was one of those that I used: http://www.polyamory.org/~joe/polypaper.htm
There is also a newer document, written by several authors, one of whom wrote the first document: http://ego.thechicagoschool.edu/s/84...0Polyamory.pdf
Hope these help!