I don't really like the fact that my sims basically just flirt with whoever they feel like, even if they don't have the flirty trait. I don't care so much if I don't have them married off, but I have sims who are supposed to be happily married, so why are they flirting with every sim they know. I really miss having an attraction system or something, or even a faithful trait or something.
I also really hate seeing my sim couples who are max relationship with each other roll up wants to flirt with other sims they barely know, especially when their significant other is right next to them. I know sims flirt with pretty much anyone if they are feeling flirty, but it seems like its gotten more aggressive recently, and it always seems to target other sims besides their significant other who has a high relationship with them.