This movie truly is the best! I love the sci-fi/fantasy mixture, and both my oldest daughter and I found it very interesting as the characters traveled between planets, transferred their consciousness to another life-form, and explored the truly stunning world of the Na'vi. The brightly-colored plants and animals, plus the unique culture is so fun to watch! However, small amounts of cussing, sex, and violence made it a little iffy for my 13-year-old.
First of all, the Na'vi are aliens that slightly resemble human beings. The men and women's sexual parts are completely covered by loincloths, but women's breasts, nipple and all, can be seen. Most of the movie they are covered by ornate necklaces, but are visible at some points. About halfway through the movie, the two main characters have sex, or whatever you'd like to call it. It's a truly stunning scene to watch, actually. The whole idea of the Na'vi is that you are connected to the planet by the plants. The two characters are straddling each other and making out with some amount of moaning before a beautiful glowing tree, which is the heart of planet Pandora. After they are done, the female tells him that they are "mated for life". As an adult, it was beautiful, and my daughter was indifferent, but that's not such a good scene for younger kids.
Human characters use pretty much all of the basic swear words, but the main issue I had with the movie was the unnecessary scene of violence at the end, when the humans are bombing the planet and shooting at the Na'vi with semi-automatic weapons and tanks, killing many of them all because they want a special mineral that grows there. My daughter burst into tears and gesticulated at the screen with a cry of "why?!" It was really upsetting to her to see the characters she had bonded with hurt and their planet destroyed.
Still, though, the movie is a beautifully done, symbolic classic.