I, too, was disturbed by the nudity, but I was even more disturbed by the story. This little girl is made into a prostitute with the blessing of her own mother, her virginity is auctioned off, and the movie treats the whole thing matter-of-factly instead of as the tragedy that it is. I'm not even sure why I'm recommending this movie.
Actually, now that I think about it, I think I like the fact that the film allows me to be disturbed on my own rather than hitting me over the head and telling me how I should feel (as Hollywood always does). No weepy music, no over-the-top emotional scenes, just a story. Take from it what you like.