Why do guys give such half-hearted hugs?

Anonymous
Why do so many guys give such cold hugs, with the one-arm and short duration? I can kind of understand it when it's a guy hugging another guy, as it seems more manly like a 'bro-hug.' But I don't understand why they hug girls that way too, even if they're close friends?

Is is it because they're uncomfortable, feel awkward, unattracted or repulsed by the person they're hugging?
Why do guys give such half-hearted hugs?
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