Together for more than forty years, Goldie Hawn is getting candid about why her relationship with Kurt Russell is so successful. On Friday, while celebrating the 20th anniversary of The Goldie Hawn Foundation and MindUP, the actress revealed a key element to their love story. "You have to have good sex," the 78-year-old said bluntly in an interview with E! News . KURT RUSSELL, GOLDIE HAWN KISS DURING ROMANTIC ASPEN GETAWAY AFTER 40 YEARS TOGETHER "Because sex is something that connects you and creates more belonging. People who have healthy sexual relationships usually last a lot longer. But it's not just because of the act, it's because of the warmth and the intimacy that it creates," she explained. "You have to be nice to each other upon occasion," she teased. Although Hawn said having that intimacy is important, it's also the time spent recognizing your differences that really makes a relationship stick. LIKE WHAT YOU’RE READING? CL...