Maybe I'm dim for just realizing this, but when you stand in front of the machine, the artwork of Luci on the side of the cabinet shows her on her knees, facing away from the player. When somebody steps to the machine, it appears as if they are shaking and tilting her from behind in a rather... suggestive matter.
Again, I could be dim for just noticing, but it took watching a friend playing the machine from the side to realize what was going on.