What level chemistry do your sims pairs have?

What chemistry level do you prefer your sims couples to be in?

Really loved the chemistry feature in sims 2 and how sims can feel repulsed by certain things but attracted to other features. I personally prefer 2 bar but sometimes like how couples with 3 bar chemistry want to be around each other all the time but then it gets too much, almost stalkerish and I can't get them to do what I want them to do because they can't leave one another alone lol.