It seems kinda weird to me that people seem to assume that those who want the game to be a bit more mature equals them wanting things like violence in their games. I agree with many others here who said that the game just needs more consequences, needs to be a bigger challenge. The current game is far too easy in many regards. Discover University added challenging gameplay, which might have been good had they not gone too far with it. They seem to struggle with balancing the difficulty of the game, but that's nothing new. TS1 was too hard as well for many players. Let's face it, the game seems childish because it's not hard enough. It's currently too easy to form relationships, it's too easy to get promoted, it's too easy to become rich and it's too easy to become famous. The game would look much less childish if those things had a higher difficulty, maybe like TS3 or TS2 had.
The game can be open to all age groups without looking childish. Past games, especially TS2, did just that. They don't need to add adult themes to the game to achieve that. And the good thing is, in case you really want more mature themes in your game, there are enough mods out there that do just that.
