Damn, are you guys serious ?
The serious reply is that you really don't know unless you see them work, as Kevin said.
As far as your physical clues . . . .
Blonde hair/black eyebrows, eyebrow from a pencil, explorer or other car way the hell out of a young girls price range, wears way too much make-up, has piercings that we can't see

, and tatoos, Describes half the girls we go to college with and often the more attractive half.
The leg press is neutral and is more likely to indicate a fitness model.
The best way to find out is to walk up to her and ask her how much it costs for her to do a private party and whether she can get one of her friends, Candy, Porsche, and/or destiny to perform also . . maybe get some extra visual entertainment