Technically, the baby boomers didn't invent sex. They didn't even lead the sexual revolution — sexologist Alfred Kinsey published the first of his two groundbreaking sexual-behavior studies in 1948. The oral contraceptive pill appeared in 1960. And a complex confluence of social and cultural factors helped unbuckle Americans' sexual lives in the late 1960s and 1970s. But you'd be forgiven for giving boomers all the credit, since they're the ones who got to enjoy the fruits of the revolution.