People fish on the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province, July 17, 2013. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. . (Xinhua/Qin Lang)

Tourists visit the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province, July 17, 2013. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. (Xinhua/Qin Lang)

Tourists visit the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province, July 17, 2013. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. (Xinhua/Qin Lang)

Photo taken on July 17, 2013 shows the scenery at the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. (Xinhua/Qin Lang)

Photo taken on July 17, 2013 shows the scenery at the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. (Xinhua/Qin Lang)

Photo taken on July 16, 2013 shows the scenery at the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. (Xinhua/Qin Lang)

People enjoy themselves on the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province, July 17, 2013. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. . (Xinhua/Qin Lang)

People enjoy themselves on the Lugu Lake in the Yi Autonomous County of Ninglang, southwest China's Yunnan Province, July 17, 2013. Lugu is renowned for its beautiful scenery and the maintenance of the unique matriarchal system observed by the indigenous Mosuo people. . (Xinhua/Qin Lang)