On a recent episode of The View, 90-year-old sex therapist and media personality Dr. Ruth warned the roundtable of women that threesomes are "very bad" for a marriage. "Do not engage in a threesome," she said, "because that third person might be a better lover." This is bad advice. Have threesomes. But this documentary isn't about Dr. Ruth's advice, it's about Dr. Ruth. And damn, her story is long overdue for a good documentary. She is a pioneer—and a very funny one. by Chase Burns