: Sims now have natural chemistry based on their likes and dislikes, determining if they "click" or clash with others.
If you are referring to the 2015 expansion focused on group activities and clubs: The Sims 4 Juntos
: As Sims experience life, they may gain or swap personality traits based on their actions or events like a Midlife Crisis . Build/Buy & CAS : Sims now have natural chemistry based on