Memoirs of a Geisha is an interesting movie, but has sexual content (well, duh) that some might find disturbing. In one scene in particular near the beginning of the movie, it is implied that a geisha is having sex with a man off-screen. She is caught (because geisha are NOT supposed to have sex with someone they actually love!) and brought before a few other geisha by the lady in charge of the place. The lady in charge parts the skirt of the geisha who had been having sex and reaches into her crotch. No nudity is shown but it's very obvious. She sticks her finger in, and pulls it out, rubbing her fingers together in disgust with white goop stuck on them. (You can guess what it was.)
There are a few other sex scenes, but those aren't too graphic. The most upsetting/disturbing scene for me, other than the one I mentioned a moment ago, is when it is implied that Sayuri is raped. It is a very uncomfortable, tense scene. Nothing is shown, but it's very well acted and upsetting.