Touch seems to be such an important tool for enhancing social cooperation and affiliation that we have evolved a special physical route along which those subliminal feelings of social connection travel from skin to brain.
Touch is our most highly developed sense when we are born, and it remains a fundamental mode of communication throughout a baby's first year and an important influence throughout a person's life.
We have emotions for a reason; for instance, imagine pain. You have pain so that if you touch something that's hot, or if you slam your hand with a hammer, you will pull your hand away and not do that again.