I like Sam most of the time because he used to wash me when I was a kitten and he will still wash me now if I go and sit next to him and wait. I don't like washing myself, it gives me hairballs!
Besides, I am very fluffy and big-boned and it takes a long time and it is hard for me to wash my tummy because I am very muscular. Sam LIKES to groom me, it makes him feel important and everybody pets him and praises him and makes a big fuss about him which is what he likes. It is one reason they think he is a saint.