Naturally tan, hell yes. Tan because he was spending time out in the sun, eh I can take it or leave it, don't really care. Fake tan is godawful and I cannot and will not.
I don't think I would care if it's a natural darkening (or a fake one that doesn't get in my mouth). I've seen some white guys who get a really good tone on their skin after a while here.
I do dislike when I get too tanned. Last time I looked as black as coal and my job ID picture is now a mess.