Why do guys like tickling their girlfriends so much?

SummerIsMySeason
I'm asking this because my boyfriend takes every chance he can to tickle me. I don't know why he does (possibly because I scream/squeak and squirm?) but he won't tell me why! Some examples of the way he tickles me is by sneaking up from behind and tasering me in the side, tickling my sides when we hug/cuddle, poking me at random in the side, tickling my knees when we are sitting together, and tickling the bottoms of my feet when not wearing shoes. Why does he do it? Why do guys do it? I would like to know so I understand how he's feeling about our relationship an' all that.
Why do guys like tickling their girlfriends so much?
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