My parakeet is making out with my finger!!

by Carissa
(Fenton, Mo)

My male keet will fly onto my finger, and start nipping at the nail and cuticle, his eyes get all dilated and he fluffs up his head and neck feathers and starts pecking at my finger. He will put his beak right up to my finger, purr, then start rapidly nipping again. It doesn't hurt at all, and its quite funny, he does it to everyone in the family, and even to toes. Why is he doing this and what does it mean?