Typically, the defining feature of the overarching open relationship structure is that the two individuals consider each other to be the primary partners in the relationship. (scienceofrelationships.com)
She is looking for those that are interested in learning more about sex - positive affirming therapy, couple's therapy as well as non - traditional relationship structures. (respark.co)
There are some different names this particular relationship structure goes by. (adultiful.ca)