If and when they add Pets...

[sims3luva22]

Not to be gross, but I wouldn't mind actuall poo and pee. Realistic pets poop on the carpets (if they aren't trained) and I think damaged items should stay that way until repaired just like in ts1. If a puppy poops, sims should clean it up, but a stain would be more realistic after its picked up. They can scrub the stain out, or buy new carpet. I think it would be cool to see spots all over the house, and visiting sims could plug their noses or show restraint when it comes to "house smells" just like room environment and cooked food, or when someone has body odor. If they were to move out, or sell the house, the price could go down because of the damaged property.