It depends on how you "get into" a scene. I usually imagine myself in place of the stud so I prefer that the girl looks in his direction.

The worst are the girls who stare at a monitor off-camera. This is usually an Ed Powers specialty, but in Butt Cream Pie 4 Teagan seemed to spend the entire scene looking at the bookshelf to the right of my TV.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock