Polyamory

One day in the summer of 1971, my parents held hands, closed their eyes and jumped out of their conventional marriage into something strange and new. I was 9 years old at the time, and we were camping at Betsy Lake in the High Unitas Wilderness with another family of five. We were halfway into the camping trip when the six of us kids realized our parents had mixed and matched: My father was in the tent with their mother, and their father was in the tent with my mother.

Laird Harrison at Salon has an interesting article about life inside a polyamorous group marriage.