What makes a girl grind with a guy in the club?

I know that 'Looks are Subjective' & stuff like that but it kinda irritates me when I see a girl grind on guys she otherwise wouldn't even look at if the cross each other on the road or on a college campus lol :D So I thought of posting a survey as per what I see ot observe in clubs, but you can add more options along with your views in comments.
Looks
Physique
Dance (as in he knows how to move his body)
Aggression
Attitude or Xfactor as he stands in a corner
Depends on how drunk the girl is
Select gender and age to cast your vote:
What makes a girl grind with a guy in the club?
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