Acting is a really simple job - it's just hard to do. You just have to be that person with their background in that situation. That's all it is. My kids do it all the time when they're dressing up and playing games.
Augustine does not disagree with this when he teaches that it is a faculty of the reason and the will to choose good with the assistance of grace; evil, when grace is absent.
Guys are simple... women are not simple and they always assume that men must be just as complicated as they are, only way more mysterious. The whole point is guys are not thinking much. They are just what they appear to be. Tragically.