As the country singer Kacey Musgraves, 28, sings, “Make lots of noise and kiss lots of boys/Or kiss lots of girls if that’s something you’re into”—not exactly your father’s country song. But it is iGen’s country song. “I believe people should do what they want with their own bodies,” Musgraves says. “The majority of the younger people that listen to my music don’t think twice about the things I’m singing about.”

