Sims will build positive relationships faster with Sims that share their likes and slower with Sims who don't. Als tweaks preference autonomy a little. Note: I do not recommend this mod for lower computer specs.
This is a mod that makes your Sims "loyal" to loved ones. That is, They will not autonomously flirt with Sims other than their significant other. They will always turn down romantic interactions with other Sims other than their significant other.