How many polyfolks are there? News media always ask, and no one really knows.
For instance, writes New York University sex researcher Zhana Vrangalova, recent research "has found that, among the general heterosexual population [of US adults], about 4 to 5 percent are engaged in some form of consensual nonmonogamy." That would be about 10 to 12 million individuals.
See on polyinthemedia.blogspot.com