Cheaters may get more attention, but couples of all types are more monogamous than they used to be, finds research on more than 6,800 people in heterosexual, gay and lesbian relationships.
"There's dramatically less extra-relational sexual behavior in the year 2000 than in the year 1975 for all couple types," says researcher Robert-Jay Green, a psychology professor at Alliant International University in San Francisco.
Although the most recent data are from 2000, Green says it allowed for a direct comparison because the questions posed were the same used in 1975....