To be honest when I was at her age I knew about a lot of dirty things because my classmates always talked about porn XD.I remember how when we were in 7th grade,one of the boys in my class tricked a girl into writing linken to porn websites on the blackboard XD
Well then... XD I mostly learned this stuff when I was I think 11 from my niece (she's a jaar older than me, actually), but now I've just embraced all I know as a pervert. XD