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How Americans think about sex—and who they have it with—has changed dramatically in a short period of time. The research, published today in the , analyzed survey data from roughly 30,000 Americans from 1973 to 2014.In a new study, researchers find that people in the U. People in the nationally representative General Social Survey were asked about their sexual behavior and attitudes about same-sex experiences.They are then notified of any matches, where both people swiped right on each other's profiles.Thus, users can quickly view hundreds of local singles and decide with a quick swipe of their finger if they’re interested or not."That’s why it comes down to this individualistic viewpoint: do what’s right for you."That attitude is not always on the side of tolerance for people's differences, of course.But in this case, the upsides are clear: greater freedom, tolerance, equality and acceptance of fluid sexual behavior.

In 2014, 49% of people surveyed—and 63% of Millennials—stated that this kind of relationship was “not wrong at all.”"Overall, it suggests that our sexuality has become much more free and open, that Americans feel much more freedom to express themselves sexually in a way that they see fit," Twenge says.

The number of Americans who had had sex with someone of the same sex doubled between 19—for both men (4.5% in 1990 to 8.2% in 2014) and women (3.6% in 1990 to 8.7% in 2014).

These increases didn't appear to be driven exclusively by people who identify as gay or lesbian, but by people who have had sex with people both sexes, says study author Jean Twenge, a psychology professor at San Diego State University and author of the book “What we’re seeing is this movement toward more sexual freedom,” says Twenge.

The question has great meaning in American society today, since more than 75 percent of college students report engaging in at least one hookup, 30 percent of which include sex (Paul & Hayes, 2002).

The actual overall prevalence of hooking up is likely even higher, since these estimates are limited to college students.