Sorry if this is a thread that's been done before. But I couldn't find anything when I searched.

I noticed this today when I saw some guy act that way to a girl. But I've noticed that most guys' first instinct of how to attract a girl is to be childish. It got me thinking to why most inexperienced guys first jump to that as being their method of attracting someone? And I don't think most of them even consciously do it. Where does this stem from? Is that just a natural instinct, or does somewhere along the line of growing up most guys subconsciously learn that's the way to go?

I think girls also do the same, but it seems more apparent in guys.