“Yewande, you are an orgasmic woman!” In a scene from Channel 4’s new documentary Secrets of the Female Orgasm, sex coach Lacey Haynes crouches on the floor of her studio, whispering this mantra to a recumbent Yewande Biala. The former Love Island contestant can’t help but dissolve in laughter. Her giggles are one part awkwardness, one part cynicism. “It’s funny because I don’t believe it,” she tells Haynes.