Why do girls like to snuggle up against a man's chest or arms?

Just curious on what you girls will say.
My girlfriend loves my arms and sleep on them. Whenever she's scared or feels sad she likes to be held against my chest. I asked her why she does those things and that's what she said (when she's sad or feels scared or tired). It's kind of a safety blanket to her and since I'm taller she likes to feel small and it makes her feel very loved.
Why do girls like to snuggle up against a man's chest or arms?
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