Guys, why would you touch a girl's leg?

Pretty much the guy came over to ask me a question. He ended up sitting next to me so I could explain a math problem. Since it was a study area I was talking with other classmates. I said something jokingly, everyone laughed. The guy laughed too, then placed his hand on my leg (a little above my knee, nothing creepy) to draw my attention back to his question.

To be honest it didn't really hit me at that moment. (I didn't feel uncomfortable) but afterward I thought about it and was thinking if a guy would normally touch a girl's leg, if he was attracted to a girl or not.
+1 y
To add, he kinda brushed his hand over my leg. It wasn't like a quick touch
Guys, why would you touch a girl's leg?
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