Question about grinding with girls, at a club?

I know a lot of girl don't like to grind at school dances, and i understand that 100% because its tacky. but at clubs it seems the girls dress very sexy and sometimes skanky. girls at clubs seem to want to grind a lot more than girls at school or just regular dances. i'm going to a club this weekend with a girl, and i don't want to start grinding her and then have her say stop or think i'm a perv and i dont want to flat out ask her because then she might think thats all i want. how do i know if she wants to grind?Question about grinding with girls, at a club?
you'll be able to tell from her body language... if she wants to grind she'll initiate the contact