In 1960, British zoologist Desmond Morris was the first to suggest that kissing (scientifically speaking, osculation, from the Latin word “os” - mouth) arose from the habit of female apes to chew food for their babies and then feed them mouth to mouth. This is what chimpanzees do, and most likely our ancestors did this. In some nations, even now, mothers sometimes feed their babies chewed food. Pressing lips to lips appears to soothe a hungry baby and express love and care.