For a lot of guys, the gym seems like a natural place to scope out chicks. After all, you already know she takes care of her body, and the natural state of red-faced sweatiness makes it pretty easy to imagine her mid-coitus. But here's a rule of thumb: Don't try to mack when the object of your desire is in a T-shirt made see-through by her own sweat. Or spread-eagled on a thigh machine. Or ...