Deep in the Karen hills, a girl dances. Eyes painted black, her ornate dress flickers in the firelight as she slowly moves to the beat of a drum. Far away, is "Beautiful Bangkok," the land of dreams, where girls dance to a different tune. With shorter skirts, and loud music pumping in their ears, men stare greedily; "Afraid or not, I have to sleep with them all. Because I had been sold," says Noi.

Government repression of ethnic minorities means "There is trouble all over the country." As men leave villages to fight, soldiers steal food and money from those left behind. "They come again and again. We must sell the oxen, and the cart, then the fields piece by piece. Until the day there is nothing more to sell." This is war, and for those living in the mountains, desperate times have called for desperate measures - even selling their children.

Some traditional beliefs do not help Burma's Buddhist minorities. According to Buddha "Sons provide for the life beyond. Daughters provide for this life." Girls are taught they are always in debt to their parents. Because of the war these girls can no longer pay their debt through tending fields, or bearing children. It's why Noi believed her only option was to work for sex. "I was scared and shaking. But I did it." And they are faced with a dilemma. If they escape the brothels, they disgrace their family. And if they do return after years in service only "Hard eyes fall upon us. They say we are a pretty fruit gone rotten inside".

Beautiful Me Che didn't know what "selling your body meant". Aged 10 she thought they "cut off parts of your body and sold them." In Thailand, she soon discovered its true meaning. Over six years she was forced to have sex with six-thousand men. When she became pregnant the brothel's "Mamasan" told her "Daughter, like mother will sell her body." So, when the baby died "I was pleased... she would have sinned when she got older." Unfortunately her story is not rare, it is repeated throughout Bangkok.

Burma's minorities are faced with an uncertain future. Forced to fight for their existence, they sacrifice men to fight in the hills, and young girls to Thai brothels. And the wealth promised from prostitution is rarely seen back home. "They sold me three times as a virgin, but I never saw any money."

Unflinching in its account of abuse and corruption 'Sacrifice' derives much of its power from the narrative of four girls, who speak with a painful directness beyond their young years. Added to the striking images used to illustrate their stories, this is both an emotive and enthralling film of a needless sacrifice - but one set to continue.