Kissing a Girl on the Head?

I kiss my girlfriend on the head all the time. She's a whole lot shorter than me, so every time we hug I gently kiss the top of her head. She seemingly enjoys the gesture but some people tell me this communicates I'm interested in her as my friend and not as a partner.

What do other girls think? Guys, do you ever do this for your girlfriend?
Kissing a Girl on the Head?
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