The cat does not offer services. The cat offers itself – William S. Burroughs
Many people had been misunderstand that cats are naturally anti-social and not friendly. But the actual fact is not. Instead of looking at cats through a human lens of what “friendliness” means, it’s worth learning the unique ways that cats show affection. For example, if your cat rubs up against your leg, she’s telling you you’re part of the colony.
Source from : http://www.purinaone.com/pursuits/the-true-nature-of-cats/humans-and-cats-a-history