I made two sims one shy,angler, love the outdoors, lucky and eco friendly. The other shy, green thumb, loves the outdoors, nurturing and no sense of humor. They know three traits from the start, she learned after one good talk that he is lucky but I have them fall in love and get married and they still don't know each other is shy and I don't think they ever will. So shy and no sense of humor they can't learn.