Why does my cat like to lick my hair.

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We have 2 cats. A black and white year 1/2 tuxedo named Socks picture below who likes to lick my hair. When I put my head down or when he goes on me he licks my hair. Also when he goes on my stomach he will move his paws slowly back and forth. I don't know why.

Also my other cat Tiger the light brown one likes to do suckling when on me.

Check out my webpage http://home.earthlink.net/~tonyram057/ourcats/
for more info.