The behavioral trend, reflected in an annual survey conducted between 1973 and 2014, was fueled largely by people who had sex with both men and women. There has been little change in the number of people reporting exclusively homosexual behavior.
The changes were reported Wednesday in the Archives of Sexual Behavior. The research team included faculty from Widener, Florida Atlantic and San Diego State universities. A total of 33,728 people answered the survey over the 41-year period.