Why do men like watching women put on make-up?

Anonymous
I found myself a bit disturbed while on the train last week when a grown man studied my in-transit makeup application as though his life depended on it. He kept looking at me and when I reached from my lip gloss his eyes followed.

It made me feel uncomfortable. I tried to stare at him back, but he kept looking at me, transfixed by the way I put on blush and mascara. Is putting on makeup an intimate thing? I have a friend who won't let her boyfriend watch to put on makeup. I know they realize the difference between when you wake up and when you put makeup on, bit it's more about the finished product.

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I will pick best answer to whoever explains this to me
Why do men like watching women put on make-up?
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