We can add something else to a long list of 'things that millennials are killing.' Along with napkins, American cheese and golf, heterosexual people in their 20s are having less sex.Could our connectivity be behind the decline? Is pornography replacing IRL relations? Has hookup culture put intimacy on the outs? Or are we just too busy to get busy?Want to support 1A? Give to your local public radio station and subscribe to our podcast. Have questions? Find us on Twitter @1a.