 "I enjoy being a girl," beams 16-year-old La Mu. "Girls can do anything. Isn t that great?" It s an unusual sentiment to hear in China, a country whose traditional preference for boys combined with its stringent population control policy limiting urban couples to one child has resulted in an inconvenient shortage of women and wives. Male babies in China now outnumber girls by a ratio of 112 to 100; some researchers say it s 117 to 100. But La Mu lives beyond the strictures of mainstream Chinese society. She is part of the Mosuo, an ethnic minority that has a matriarchal society, one of the last in the world. On Rough Cut this week, you ll meet La Mu and several extraordinary Mosuo women as we travel to "The Women s Kingdom" in southwest China, not far from the Tibetan Buddhist city the Chinese have renamed Shangri-La. Reporter Xiaoli Zhou, who comes from Shanghai, told us she had always wanted to visit the Mosuo region to see for herself how much freedom a woman might enjoy in China. In 2004, we sponsored Zhou on such a trek as part of our FRONTLINE/World Fellows program for promising journalism students. Zhou graduated from the U.C. Berkeley Graduate School of Journalism in May 2005. In the 1970s, a road was built into the mountainous area where the Mosuo live. Before that time, the region was very isolated. But, since then, it has opened up to the outside world, and in recent years, the Chinese have marketed the area -- particularly the beautiful Lugu Lake region -- as a tourist destination. Now it draws tens of thousands of visitors each year, attracted in part by tales of "free love." "Why would you want the marriage license to handcuff yourself?" a blunt-spoken Mosuo woman named Cha Cuo asks Zhou. For Mosuo women, it is not an idle question. In their matriarchal society, they do not marry. They practice what they call "walking marriage" in which a woman may invite a man into her hut to spend a "sweet night," but he must leave by daybreak. If a pregnancy results from this union, the child will be raised by the woman and her family. "You Han people [the majority Chinese] are so different," Cha Cuo tells Zhou in the film. "If the kid doesn t have a father, only a mother, and lives in the city, people would call him a wild child. Who would ever say that here?" The 27-year-old Cha Cuo is one of the most memorable characters you are likely to meet on screen. Self-assured, physically strong, emotionally direct, we see her singing and dancing, and rowing across a deep blue lake. But in frank conversations with Zhou, she also reveals the strains in her life and her doubts about the future of Mosuo culture.