Puppy won't stop licking us!

Hello, everyone. We have a 5 1/2 month old toy poodle who won't stop licking us. I don't mind too much that he loves to lick my feet and arms (I don't let him lick my face) but it has become quite embarassing when guests come over. With the warm weather, most of our guests come with sandals, flip-flops, etc, and little Travis thinks their feet are a tasty treat. Some people do not like their feet being licked, but Travis won't stop, no matter what we do. The only effective method we have found is to squirt him with water while saying, "No lick." But, this does not stop him from doing this to anyone and everyone who walks through our door. We still have to be vigilant with the water bottle, or he will do it almost the whole time the person/people are visiting us. The only thing he seems to excessively lick is people. He doesn't do this with anything else. It's almost like he likes the salt on our skin, and can't get enough of it. Does anyone know why dogs/puppies do this? Will he eventually grow out of this? What else can I do to teach him not to do this, at least to the guests in our home? Any and all ideas, comments, and suggestions are welcome.

Thanks!

Patricia