I have been “in the lifestyle” for several decades. I also have been sort of a hobbyist researcher. In the early 1980s it was believed that about eight percent of the U.S. population had tried “swinging”, as it was called at the time with about two percent active at any given time.
It appears the numbers have increased significantly:
Approximately 20 percent of American adults have engaged in consensual non-monogamy: polyamory, threesomes, swinging, and group sex.
This can’t happen fast enough. I would love to be more open about our lifestyle and to also have a wider variety of potential playmates.