Why do guys like to smack girls butts?

I don't get it, my boyfriend does it & when I ask him why he just smiles & winks. Like this morning I woke up before him & decided to go make something to eat. I'm kinda on the short side 5'1 so some things I can't reach, well I decided I would crawl lol lol lol I'm the clumsiest person ever! Anyway he saw me & came and picked me up to get me off the counter & he got it & gave it to me. But when I was walking away & he smacked my butt! & says next time come wake me up to get it. And walked off smiling like he just won something.

Is it a reason guys do this? Can someone kinda explain it to me?
Why do guys like to smack girls butts?
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