More than exponential growth in the percent of the population with access to same sex marriage in their state:
Graph by Philip Cohen.
And here’s the global data, thanks to @filipspagnoli.Lisa Wade, PhD is a Visiting Scholar at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming Introduction to Sociology text. You can follow her on Twitter, Facebook, and Instagram.