Question:
why do some cats lick people all the time? my cat does and sometimes it drives me crazy!!
Answer:
Maybe his daddy was a dog.
Sorry, couldn't resist that. Some "why" questions about cats have no good answers. And that's the way they like it.

Answer:
wcoastbreeze wrote: why do some cats lick people all the time? my cat does and sometimes it drives me crazy!!
Mine does, I think he is showing affection by 'grooming' me as he does himself. Friendly cats groom each other, I believe.
Alex
Co-owner of Khamun, black 5 y-o and Ramsay, black and white 1 y-o.
http://alexandjustine.smugmug.com/
Answer:
There are several likely explanations for why cats lick people: 1) allogrooming (referred to by akiralx, above), 2) scent and taste sampling, 3) salt in sweat.