Why do couples use pet names and baby talk?

Baby, Boo Boo, Sugar Cakes, Honey, Kitten, Sunshine, Love Bunny. If you use one of these or another pet name for your partner, US American psychologist Dr. Suzanne Degges-White says, that might be a very good sign about your relationship. In this Psychology Today article, Dr. Degges-White discusses the importance of pet names in couplespeak.