I love this phrase, coined by Australian sex expert Rosie King. nzoom.com quotes her as saying,

That skin hunger is with us from the cradle to the grave.  People think they want a fuck. What they really want is a warm body next to them in bed - they don't know how to get that without engaging in sexual activity."

When we don't know how to love, we can find ourselves settling for what King calls fraudulent forms of intimacy: drugs and alcohol to break down the walls with another person, food to fill us up inside, sex with someone we might not trust to take care of the dog.