== Lust, Caution == 

 This is a film which many people have suggested contains unsimulated sex. I have read a few interviews with Ang Lee where, from what he says, that conclusion seems inescapable. Does anyone have anything definitive on this? The film (at least in the US) carries a disclaimer during its end credits to the effect that the participants in the explicit sex scenes were over 18. Isn't it a legal requirement in the US for films with unsimulated sexual content (such as pornographic films) to carry such a disclaimer?