Why do guys always want to hug and stand too close even though we've just met?

Since back in college no matter what the circumstances guys have always found a way to get into my personal space and flirt playfully with me, which includes trying to hug/cuddle lightly or finding an excuse to whisper something into my ear so they can nuzzle my neck and make me giggle, even if we barely know one another. I'm conservative, so I always nudge the guy back. The attention seems sweet, especially since they ARE gentlemanly enough to pull back when I ask them. They really ARE just being playful, kind of the same way a big puppy cuddles up to you, you know?

Back in college this sort of made sense... I was young and cute. But now it's a little baffling, esp since there are usually much younger (hotter) options around in my opinion.

Why do guys always want to hug and stand too close even though we've just met?
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