Twenty years ago last weekend, Britney Spears released her anthem, “I’m A Slave 4 U,” which announced, paradoxically, the Princess of Pop’s newfound sexual freedom. Shedding her “good girl next door” image for a more sultry schtick, Spears famously performed the song at the MTV Video Music Awards that September, clad in little more than a massive snake wrapped around her neck. In retrospect, this moment of pop culture ephemera now feels prophetic. Britney indeed...