Why do girls grab their own asses sometimes?

Its weird. There was a girl in the hallway who had a nice *** who just kept grabbing her butt and almost squeezing it and I don't even think she knew that a guy was behind her(me). She was legit grabbing it. What does that even mean?

TBH it was rly hot lol, and i kinda enjoyed it(shame on me lmao). But I just want to know why some girls(usually hot) do this.

Also, its the same girl I've seen do it and its always the same person, no one different. and she didn't see me behind her so she wasn't teasing me(on purpose lol)

I just want to know, im not a perv

?2017-01-03T03:14:23Z

She's the only one that does.